Cf. Townsend\u2019s Shearwater.<\/em><\/strong>\u00a0 Newell\u2019s and Townsend\u2019s Shearwaters were formerly considered conspecific and have essentially identical plumages.\u00a0 They are known to overlap to some extent in the waters off of western Mexico in the general vicinities of Clipperton and the Revillagigedo Islands.<\/p>

The differences between them are too slight to be useful under most field conditions.\u00a0 Newell\u2019s has more extensive white on its undertail coverts, and a slightly longer tail.\u00a0 Newell\u2019s also shows (at least on average) somewhat sharper contrast between black and white on the neck, where Townsend\u2019s appears grayer and blurrier.<\/p>

Townsend\u2019s breeds from January to July, whereas Newell\u2019s breeds from April to October, so their molt timing should generally differ by about three months.\u00a0 Knowledge of their breeding seasons can also be useful to understanding the likelihood of encountering them near to or far from their breeding islands.<\/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