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Double-crested Cormorant, Breeding Plumage

Double-crested Cormorant, Breeding Plumage.jpg American Merganser, MaleThumbnailsBlack Tern, AdultAmerican Merganser, MaleThumbnailsBlack Tern, AdultAmerican Merganser, MaleThumbnailsBlack Tern, Adult

Phalacrocorax auritus auritus (Lesson)
Other Name.—Shag.

Description.—Four toes all webbed together; bill long and strongly hooked at tip; tail stiff and moderately long; plumage thick and firm. 16Adults in breeding plumage: Glossy greenish black, save on back which is dark gray, each feather being margined with lighter gray; two filamentous tufts of black feathers on back of head; neck with thin sprinkling of silken white feathers during period of courtship; bill blackish, marked at base with dull yellow; sack under bill yellow; eyes bright green. Immature and adult in winter (the plumage usually seen in Pennsylvania): Without crests, and whole plumage brownish black, somewhat mottled beneath, and with light area on throat; eyes grayish green, not bright green. Length: About 30 inches.

Range in Pennsylvania.—A migrant found principally along the larger water-ways from about March 20 to May 10 and from September 15 to November 15. It is occasionally seen in winter when the water is free of ice.

An Introduction to the Birds of Pennsylvania
By George Miksch Sutton
Published in 1928
Available from gutenberg.org
Posted on
Sunday 30 May 2021