Bill of Cuckoo

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“The beak or bill of birds is composed of two bony pieces, called mandibles, surrounded by a horny substance, differing both in form and thickness, according to the habits of the species.”

Keywords

bird head beak bill face

Galleries

Bird Anatomy

Source

Hazlitt Alva Cuppy PH.D., Editor Beauties and Wonders of Land and Sea (Springfield, OH: Mast, Crowell & Kirkpatrick, 1895)

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