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re: Hoatzin claws?
Are they (the bony core of the claw that is) truly homologous with the
manual unguals of nonavian theropods or are they a novel development?
Romer's The Vertebrate Body - Shorter version illustrates the manus of
Anser (the goose). It has theropod claws. And I've had the pleasure of
dismantling a rhea , only the claws are curved more and sharp like