..."There is one factor that has militated against the condor more thanany other one thing; namely, the restriction in its food source... 
William T. Hornaday 「Our Vanishing Wild Life」
...Cathartidae, Condor, Turkey (American, New World)Vultures, 9 sp...
John Albert Leach 「An Australian Bird Book」
...The Condor, IV, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor,IX, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor IX, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor XI, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The Condor, VIII, pp...
Frank M. Chapman 「Color Key to North American Birds」
...The jungles of India, the virgin forests of Brazil, thetowering crests of the Andes, beloved by the Condor, were reduced, asa field for exploration, to a patch of pebbles enclosed within fourwalls...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
...The American Condor is the largest of thebirds of prey, and is said to partake of the ferocity of theEagle and the filthiness of the Vulture...
Various 「Natural History in Anecdote」
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