. The bird, its form and function . Fig. 204.—Harpy Eagle. (Courtesy of Dr. Frank Baker.) 262 Heads and Necks 263 The Laughing Thrush of the Himalaya Mountainshas every feather upon its head lengthened and perma-nently erect, forming a soft, spreading Fig. 205.—Hooded Merganser. (From a photograph provided by the AmericanMuseum of Natural History.) In almost every Family of birds we find certain spe-cies with long, well-developed crests. Among the ducks,the Hooded Merganser has a compressed, semicircularhalo of delicate feathers, while the Mandarin Duck hasa broad, many-coloured, erecti
. The bird, its form and function . Fig. 204.—Harpy Eagle. (Courtesy of Dr. Frank Baker.) 262 Heads and Necks 263 The Laughing Thrush of the Himalaya Mountainshas every feather upon its head lengthened and perma-nently erect, forming a soft, spreading Fig. 205.—Hooded Merganser. (From a photograph provided by the AmericanMuseum of Natural History.) In almost every Family of birds we find certain spe-cies with long, well-developed crests. Among the ducks,the Hooded Merganser has a compressed, semicircularhalo of delicate feathers, while the Mandarin Duck hasa broad, many-coloured, erectile crown, which is con- 264 The Bird spicuous even in contrast with the gorgeous ornamenta-tion of the body of this feathered harlequin. Of birdsof prey, the Harpy Eagle has perhaps the most imposingcrown of feathers. Sometimes the crest is sharply set off from the restof the birds plumage, as in the scarlet-plumed wood-peckers, whose crests give them the appearance of havinglong hair, which is gracefully brushed straight backwardand upward. We must not discuss the subject of crests without men-tion of two birds of extraordinary appearance, the CrownedCrane and the Umbrella-bird. The former illustratesadmirably what strange and unfeather-like forms
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