Unlike adults, juvenile Streaked Shearwaters overfly mountains during their first migration

16 Nov 2017 - 18:00 -- Ernest Garcia

Telemetric studies have shown that juvenile Streaked Shearwaters Calonectris leucomelas from a colony in the north of Honshu Island, Japan, take a different route from adults during their first southward migration. Juveniles orientate south, resulting in an overland crossing that includes mountains. Adults travel over water, around the land mass. Experience thus seems to modify an innate tendency to migrate south, so that birds remain in contact with the marine environment#R.

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Streaked Shearwater (Calonectris leucomelas)

Taxonomy:

Procellaria leucomelas

Temminck, 1836, seas of Japan and Nagasaki Bay.

Sometimes placed in genus Procellaria. Monotypic.

Descriptive notes: 45–52 cm; 440–545 g; wingspan 103–113 cm. Large brownish shearwater with mostly white underparts, mottled head and rather large, pale bill. Head variably mottled white and blackish brown, the white usually...
figure, drawing, illustration of Streaked Shearwater (Calonectris leucomelas)