Immature Plumages.<\/em><\/strong>\u00a0 Juveniles have brown upperparts and a brown hood\u2014much like an adult Brown Booby, but the hood is less extensive (ending above the breast) and not as crisply defined.<\/p>

Unlike Brown Boobies, juvenile Masked usually has a white collar.\u00a0 Those that begin with an all-dark neck typically develop a full white collar early in their maturation.<\/p>

As they age, the areas of brown coloration recede and are replaced by white.\u00a0 The neck turns white first.\u00a0 In subadult plumage, the hood fades until it disappears altogether.<\/p>

In all immature plumages, Masked and Nazca Boobies have more extensively white underwings than other boobies of the same age class.<\/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