Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the debug-bar domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home4/birdfind/public_html/wp-includes/functions.php on line 6121

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the google-analytics-for-wordpress domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home4/birdfind/public_html/wp-includes/functions.php on line 6121

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the ht-easy-ga4 domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home4/birdfind/public_html/wp-includes/functions.php on line 6121

Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the h5ap domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home4/birdfind/public_html/wp-includes/functions.php on line 6121

Warning: Cannot modify header information - headers already sent by (output started at /home4/birdfind/public_html/wp-includes/functions.php:6121) in /home4/birdfind/public_html/wp-includes/rest-api/class-wp-rest-server.php on line 1896

Warning: Cannot modify header information - headers already sent by (output started at /home4/birdfind/public_html/wp-includes/functions.php:6121) in /home4/birdfind/public_html/wp-includes/rest-api/class-wp-rest-server.php on line 1896

Warning: Cannot modify header information - headers already sent by (output started at /home4/birdfind/public_html/wp-includes/functions.php:6121) in /home4/birdfind/public_html/wp-includes/rest-api/class-wp-rest-server.php on line 1896

Warning: Cannot modify header information - headers already sent by (output started at /home4/birdfind/public_html/wp-includes/functions.php:6121) in /home4/birdfind/public_html/wp-includes/rest-api/class-wp-rest-server.php on line 1896

Warning: Cannot modify header information - headers already sent by (output started at /home4/birdfind/public_html/wp-includes/functions.php:6121) in /home4/birdfind/public_html/wp-includes/rest-api/class-wp-rest-server.php on line 1896

Warning: Cannot modify header information - headers already sent by (output started at /home4/birdfind/public_html/wp-includes/functions.php:6121) in /home4/birdfind/public_html/wp-includes/rest-api/class-wp-rest-server.php on line 1896

Warning: Cannot modify header information - headers already sent by (output started at /home4/birdfind/public_html/wp-includes/functions.php:6121) in /home4/birdfind/public_html/wp-includes/rest-api/class-wp-rest-server.php on line 1896

Warning: Cannot modify header information - headers already sent by (output started at /home4/birdfind/public_html/wp-includes/functions.php:6121) in /home4/birdfind/public_html/wp-includes/rest-api/class-wp-rest-server.php on line 1896
{"id":52671,"date":"2020-09-03T01:31:38","date_gmt":"2020-09-03T05:31:38","guid":{"rendered":"https:\/\/www.birdfinding.info\/?p=52671"},"modified":"2020-09-03T20:46:39","modified_gmt":"2020-09-04T00:46:39","slug":"yellow-billed-tropicbird","status":"publish","type":"post","link":"https:\/\/birdfinding.info\/yellow-billed-tropicbird\/","title":{"rendered":"Yellow-billed Tropicbird"},"content":{"rendered":"\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

\u00a9 Josh Parks<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

\u00a9 Massimiliano Finzi<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Birdfinding.info <\/em><\/strong>\u21d2<\/em><\/strong>\u00a0 Locally common on and around its breeding grounds scattered across the tropical oceans, but otherwise uncommon and rarely found near continental coasts.\u00a0 Throughout the tropical Pacific, it can be seen at most islands that have cliffs suitable for nesting, including Tahiti and American Samoa.\u00a0 In Hawaii it is easy to find at many sites on Kauai (e.g., Poipu, Waimea Canyon, and Kilauea Point National Wildlife Refuge) and more locally on Oahu (e.g., Ka\u2019ena Point and Waimea Valley), Maui (e.g., Haleakala National Park and Poelua Bay), and the Big Island (e.g., Kilauea Crater, Kealakekua Bay, and Pololu).\u00a0 In Australian waters it is sometimes seen on pelagic trips out of Southport, Queensland, less often elsewhere.\u00a0 In the Indian Ocean it is common in the Seychelles, Mauritius, R\u00e9union, and Christmas Island (where many are vivid \u201cgolden\u201d morphs).\u00a0 In the South Atlantic, the most accessible sites are S\u00e3o Tom\u00e9 and Pr\u00edncipe, and it is common at the remote islands Fernando de Noronha and Asecnsion.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird<\/strong><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t

Phaethon lepturus<\/em><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Family: Phaethontidae<\/strong><\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Pantropical.<\/strong> \u00a0Breeds on mid-oceanic islands; otherwise exclusively pelagic.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Approximate range of the Yellow-billed Tropicbird (including Catesby\u2019s in the North Atlantic).\u00a0 \u00a9 BirdLife International 2018<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Four or five subspecies are recognized\u2014one in the Pacific, one in the Atlantic, and two or three in the Indian Ocean:<\/p>

Ascensionis<\/em> breeds in the equatorial Atlantic on Fernando de Noronha (Brazil), Acension, and islands in the Gulf of Guinea (S\u00e3o Tom\u00e9, Pr\u00edncipe, and Annob\u00f3n).<\/p>

Europae<\/em> breeds on Europa Island in the southern Mozambique Channel.<\/p>

Lepturus<\/em> breeds on most tropical island groups of the Indian Ocean: the Comoros, Seychelles, Mauritius, R\u00e9union, Maldives, Chagos, Andaman, and Cocos (Keeling).<\/p>

Fulvus<\/em> breeds on Christmas Island in the eastern Indian Ocean\u2014but its status as a subspecies is dubious.\u00a0 It seems to be a localized population of lepturus<\/em> that has disproportionate representation of \u201cgolden\u201d morphs, which also occur to some extent in all other White-tailed subspecies.<\/p>

Dorotheae<\/em> breeds on many tropical island groups of the Pacific from the Ogasawara Islands and Palau east throughout Micronesia to Hawaii and south through the Solomon Islands to New Caledonia and throughout Polynesia to Easter Island.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Nonbreeding.<\/em><\/strong>\u00a0 Most populations are largely resident around the islands where they breed.\u00a0 Nonbreeding individuals disperse to surrounding seas.\u00a0 Some wander over large expanses of the tropical oceans, and there may be some seasonal movements, but if so they do not appear to be well documented.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Identification<\/strong><\/span><\/p>

Adult is white overall with two conspicuous black bars on the upperside of each wing, and a yellow bill.<\/p>

In flight, the adult\u2019s bold black primary and carpal bars distinguish it from other species (except Catesby\u2019s Tropicbird<\/strong><\/a>, which is traditionally regarded as conspecific\u2014see below for notes on distinguishing them).<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. ascensionis<\/em>. \u00a0(Pr\u00edncipe, S\u00e3o Tom\u00e9 & Pr\u00edncipe; September 23, 2017.) \u00a0\u00a9 Lars Petersson<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t

The several subspecies differ in ways that can be noticeable, with the Indian Ocean\u2019s lepturus<\/em> being the largest, often showing an orangish bill, and having slightly more black in the primaries (i.e., tending to resemble Catesby\u2019s) and the Pacific dorotheae<\/em> being the smallest, usually showing a plain, horn-colored bill, and having the most white in the primaries.<\/p>

The Atlantic ascensionis<\/em> and europae<\/em> of the southwestern Indian Ocean are roughly intermediate between the widespread Indian and Pacific subspecies.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>.\u00a0 (Saint-Pierre, R\u00e9union; April 19, 2020.) \u00a0\u00a9 Eric Gentelet<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>. \u00a0(Kilauea Point National Wildlife Refuge, Kauai, Hawaii; May 14, 2020.) \u00a0\u00a9 Eric VanderWerf<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>. \u00a0(Poipu, Kauai, Hawaii; February 17, 2019.) \u00a0\u00a9 Eric Hansen<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>. \u00a0(Offshore from Kailua-Kona, Big Island, Hawaii; September 14, 2018.) \u00a0\u00a9 James Bailey<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>. \u00a0(Wake Island, Hawaii; October 29, 2010.) \u00a0\u00a9 Eric VanderWerf<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. ascensionis<\/em>. \u00a0(Fernando de Noronha, Brazil; February 21, 2015.) \u00a0\u00a9 Rodrigo Conte<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>.\u00a0 (Aride, Seychelles; October 22, 2019.) \u00a0\u00a9 Oscar Campbell<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>.\u00a0 (Mah\u00e9, Seychelles; October 14, 2007.) \u00a0\u00a9 Paolo Mazzei<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>, showing a yellowish tinge on the tail. \u00a0(Kilauea Point National Wildlife Refuge, Kauai, Hawaii; January 2, 2018.) \u00a0\u00a9 Derek Stokes<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>, with an unusually dark-looking greenish-yellow bill. \u00a0(Poipu Cliffs, Kauai, Hawaii; March 23, 2018.) \u00a0\u00a9 Russ Morgan<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>, likely a young adult, as its bill has a distinctly dark tip. \u00a0(Kilauea Point National Wildlife Refuge, Kauai, Hawaii; November 2, 2017.) \u00a0\u00a9 Ben Anderson<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. ascensionis<\/em>. \u00a0(Fernando de Noronha, Brazil; July 21, 2016.) \u00a0\u00a9 Roberto Dall Agnol<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t

The dorsal pattern can often be seen through the wings from below, especially in strong backlighting.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, with dorsal pattern partly visible from the underside.\u00a0 (Flacq, Mauritius; January 2, 2017.) \u00a0\u00a9 Oddfeel<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, with dorsal pattern partly visible from the underside.\u00a0 (Aride, Seychelles; October 23, 2019.) \u00a0\u00a9 Oscar Campbell<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>, with dorsal pattern partly visible from the underside. \u00a0(Kilauea Point National Wildlife Refuge, Kauai, Hawaii; December 31, 2019.) \u00a0\u00a9 Patrick Sysiong<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>, with wings appearing all-white in this view. \u00a0(Kilauea Point National Wildlife Refuge, Kauai, Hawaii; May 14, 2020.) \u00a0\u00a9 Eric VanderWerf<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, with dorsal pattern partly visible from the underside. \u00a0(Kilauea Point National Wildlife Refuge, Kauai, Hawaii; June 12, 2018.) \u00a0\u00a9 Margaret Sloan<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. fulvus<\/em>, golden morph with dorsal pattern partly visible from the underside. \u00a0(Christmas Island; November 29, 2010.) \u00a0\u00a9 Jennifer Spry<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

At rest, with its wings folded, the adult\u2019s back can appear almost solid black.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, on nest, showing largely solid-black upperparts.\u00a0 (Round Island, Mauritius; December 31, 2006.) \u00a0\u00a9 Shane McPherson<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. ascensionis<\/em>, on nest, showing largely solid-black upperparts and bright-yellow bill. \u00a0(Ilha Rasa, Fernando de Noronha, Brazil; October 6, 2018.) \u00a0\u00a9 Carlos Ot\u00e1vio Araujo Gussoni<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. ascensionis<\/em>, on nest, showing pale, dull greenish or horn-colored bill. \u00a0(Boatswain Bird Island, Ascension; April 5, 2018.) \u00a0\u00a9 Noah Strycker<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, on nest, showing largely solid-black upperparts.\u00a0 (Aride, Seychelles; October 23, 2019.) \u00a0\u00a9 Oscar Campbell<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, on nest, showing orange-yellow bill\u2014much more orange than most Yellow-billed, but not unusual for this subspecies during the breeding season.\u00a0 (Bird Island, Seychelles; December 1, 2019.) \u00a0\u00a9 RJ Dodd<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, on nest, showing bright-yellow bill.\u00a0 (Cousin Island, Seychelles; August 26, 2020.) \u00a0\u00a9 Mark Smiles<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

\u201cGolden\u201d Morphs.<\/em><\/strong>\u00a0 All populations of Yellow-billed Tropicbird have some portion that show variable amounts of yellow in their plumage, often concentrated in the tail streamers, sometimes noticeable on the body and wings.<\/p>

The Christmas Island population (formally recognized as a separate subspecies, fulvus<\/em>) includes many golden morphs, earning it the nickname \u201cGolden Bosun.\u201d\u00a0 Instead of white overall, many of these individuals are generally yellowish to deep golden-yellow overall.\u00a0 However, many Christmas Island birds are simply white and not distinguishable from typical lepturus<\/em>.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. fulvus<\/em>, among the most golden of golden morphs. \u00a0(Flying Fish Cove, Christmas Island; August 14, 2015.) \u00a0\u00a9 Ian K. Barker<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. fulvus<\/em>, golden morph. \u00a0(Christmas Island; November 29, 2010.) \u00a0\u00a9 Jennifer Spry<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. fulvus<\/em>, golden morph. \u00a0(Flying Fish Cove, Christmas Island; August 9, 2015.) \u00a0\u00a9 Ian K. Barker<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. fulvus<\/em>, golden morph. \u00a0(Christmas Island; August 15, 2015.) \u00a0\u00a9 Ian K. Barker<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. fulvus<\/em>, subtle golden morph. \u00a0(Christmas Island; December 3, 2019.) \u00a0\u00a9 Carol Kwok<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. fulvus<\/em>, golden morph. \u00a0(Christmas Island; June 30, 2018.) \u00a0\u00a9 Hickson Fergusson<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. fulvus<\/em>, golden morph. \u00a0(Christmas Island; August 15, 2015.) \u00a0\u00a9 Ian K. Barker<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. fulvus<\/em>, golden morph with dorsal pattern partly visible from the underside. \u00a0(Christmas Island; December 23, 2019.) \u00a0\u00a9 hokoonwong<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. fulvus<\/em>, golden morph with dorsal pattern partly visible from the underside. \u00a0(Tai Jin House, Christmas Island; October 3, 2016.) \u00a0\u00a9 Bill Bacon<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Immature Plumages.<\/em><\/strong>\u00a0 The juvenile\u2019s head typically appears mostly white with a slight \u201ceye-shadow\u201d and \u201cteardrop.\u201d Older immatures typically have a broad blackish eyeline that extends back to the nape<\/p>

The bill is typically pale overall, often darker toward the tip.<\/p>

Immatures\u2019 upperparts appear generally white with subtle black barring across the back and wing-coverts.<\/p>

The amount of black visible in immatures\u2019 wings varies.\u00a0 At rest, the folded wings may appear mostly white or mostly black.<\/p>

In flight, immatures typically show distinct black bars in the outer primaries\u2014similar to the adults\u2019 primaries\u2014but usually lack distinct carpal bars.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, juvenile showing heavier-than-average black barring on the upperpart and a pale bill with an extensively blackish tip.\u00a0 (Cousin Island, Seychelles; November 12, 2009.) \u00a0\u00a9 Erkki Lehtovirta<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>, immature showing greenish-yellow bill. \u00a0(Offshore from Southport, Queensland, Australia; February 19, 2011.) \u00a0\u00a9 Chris Wiley<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. dorotheae<\/em>, immature showing mostly pale bill with darker tip. \u00a0(Hong Kong; May 4, 2008.) \u00a0\u00a9 carmenor<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, juvenile showing mostly pale bill.\u00a0 (Cousin Island, Seychelles; May 12, 2009.)\u00a0 \u00a9 sergiocanobbio<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, juvenile showing mostly pale bill.\u00a0 (Aride, Seychelles; October 23, 2019.) \u00a0\u00a9 Oscar Campbell<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, juvenile showing mostly pale bill.\u00a0 (Aride, Seychelles; October 23, 2019.) \u00a0\u00a9 Oscar Campbell<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t

Yellow-billed Tropicbird, P. l. lepturus<\/em>, juvenile showing heavier-than-average black barring on the upperpart and an apparently dark pinkish bill with an extensively blackish tip.\u00a0 (Bird Island, Seychelles; August 30, 2009.)\u00a0 \u00a9 Martyn Drabik-Hamshare<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\tVoice.<\/em><\/strong>\u00a0 Typical calls are harsh, high-pitched shrieks and trills: