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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."

Bill of Cormorant

"The beak or bill of birds is composed of two bony pieces, called mandibles, surrounded by a horny substance,…

"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."

Bill of Crane

"The beak or bill of birds is composed of two bony pieces, called mandibles, surrounded by a horny substance,…

"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."

Bill of Cuckoo

"The beak or bill of birds is composed of two bony pieces, called mandibles, surrounded by a horny substance,…

"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."

Bill of Eagle

"The beak or bill of birds is composed of two bony pieces, called mandibles, surrounded by a horny substance,…

"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."

Bill of Goose

"The beak or bill of birds is composed of two bony pieces, called mandibles, surrounded by a horny substance,…

"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."

Bill of Sparrow

"The beak or bill of birds is composed of two bony pieces, called mandibles, surrounded by a horny substance,…

"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."

Bill of Toucan

"The beak or bill of birds is composed of two bony pieces, called mandibles, surrounded by a horny substance,…