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Re: Re-emergence of lost features.
>Are any examples of normal-winged birds with throw-back clawed hands =
I wouldn't call them throwbacks. Many birds have claws for display and
other obscure functions. Small claws are found in many a variety of
birds ranging from hawks, ducks, ostiches, rheas, rails, pelecans, etc.
They are actually pretty common and are distuinghing for many species.
The hoatzin is the best example of an animal with a clawed hand. The
clawed and seperate phalanges may be an example of arrested development
that was selected for better tree-clinging abilities for the juveniles.
The phorusrhacid manus was probably a predatory adaption. The mobile
alular claw suggests this is the most likely possibility. What is
interesting about the phorusrhacid weakly developed carpotmetacarpus is
that wrist flexion is reduced. This is certainly a predatory adaptation
and it shows that a mobile manus is not exceptable for predation.
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