..."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」
...Often also their beaks wouldbecome interlocked...
George Murray Levick 「Antarctic Penguins」
..." 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 longer 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.」
..." The short-faced race did not exist at this period, as Willughby could not have overlooked birds so remarkable for their small size and short beaks...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Tegetmeier, by seizing and shaking each other with their beaks...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...They would even snap with their beaks at the dogs, and drive them away from any spot which they coveted...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
... It would, therefore, appear as if, during the reduction of their beaks, their wings had retained a little of that excess of length which is characteristic of their nearest relations and progenitors...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The two opponents face eachother, their feathers bristling up, their necks stretched out, theirheads low, and their beaks ready for the onslaught...
Robert Jennings 「Sheep, Swine, and Poultry」
... 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」
...Barbets are heavily-built birdsof medium size, armed with formidable beaks, which they do nothesitate to use for aggressive purposes...
Douglas Dewar 「Birds of the Indian Hills」
...What else, then, could they bring? Well, nothing at all, indeed, intheir beaks; for the food of a baby dove requires especial preparation...
Edith M. Patch 「Bird Stories」
...In a few minutes we heard her mate answer,and presently the two birds came hurrying to thespot, both with loaded beaks...
John Burroughs 「Bird Stories from Burroughs」
...The parent birds, in the mean while, keptup the most agonizing cry, at times flutteringfuriously about their pursuer, and actually layinghold of his tail with their beaks and claws...
John Burroughs 「Bird Stories from Burroughs」
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