..."Many other revolting sights, such as the remains of young birdsthat had been left to starve, and birds with broken legs anddeformed beaks were to be seen... 
William T. Hornaday 「Our Vanishing Wild Life」
...This he would carry by the tail to his sleeping pets, arouse them bydangling it against their heads, at which, while half asleep, theywould click their beaks like castanets...
Neltje Blanchan 「Birds Every Child Should Know」
...The beaks are well developed and finely serrate in all species...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
... They are rather larger than the largest rock-pigeon, with longer and more massive beaks...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
..." From Madras I have received several specimens of the common Tumbler of India, differing slightly from each other in the length of their beaks...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Pigeons with their beaks generally shorter than that of the Rock-pigeon,proportionally with the size of their bodies...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...They differ greatly from each other and from the rock-pigeon in plumage, slightly in size and proportions of body, in size of feet, and in the length and thickness of their beaks...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
... Most pigeons have small feet, apparently caused by their lessened use, and from correlation, as it would appear, their beaks have likewise become reduced in length...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
... draggled wretches we had been accustomed to see; they are now lively, happy birds with a splendid gloss on their feathers and beaks as bright a yellow as the blackbird's...
W. H. Hudson 「Birds in Town and Village」
...Their nests arebuilt among the branches of the fir trees, and there they disportthemselves gaily, climbing nimbly, and assisting their movements, asparrots do, with their beaks...
Various 「Birds Illustrated by Color Photograph [April, 1897]」
...But Ardea andthe other snowy herons ran about in a lively way, spying out the littlefishes with their bright yellow eyes, and catching them up quickly intheir black beaks...
Edith M. Patch 「Bird Stories」
... Thosedreadful feathered females! How they coquetted! How they flirted! Howthey sleeked and flattened their plumage, and with half-open beaks andsparkling eyes, hopped closer and closer as if charmed...
Gene Stratton-Porter 「The Song of the Cardinal」
...The birds usually locked beaks, andheld their grip half a minute at a time...
John Burroughs 「Bird Stories from Burroughs」
...They had foodin their beaks, and, as we paused, showed greatsigns of alarm, indicating that the nest was inthe immediate vicinity...
John Burroughs 「Bird Stories from Burroughs」
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