...Nostrils opening in a cere at the base of the bill; hook ofbill and claws well developed; plumage firm and close;tarsus usually largely bare...
Frank M. Chapman 「Color Key to North American Birds」
...Theskin round the eye of both species is much larger than the cere roundthat of the common cockatoo...
Charles Sturt 「Expedition into Central Australia」
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