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On Thu, 21 Apr 2011, Ronald Orenstein wrote:
A snail-picking adaptation might have led to a digit such as those in
alvarezsaurs, but why would the other digits be lost (they might be useful in
picking the animal out of the shell, for example)? And why would such a
strongly-muscled arm be required? If the arms were used in foraging it seems
Those were really big snails. The Saber Toothed Snail.