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RE: ABSRD BAND on Sinornithosaurus feathers

I don't really understand why one creature, a bird or protobird, which, say
eats (insert your target food supply), has to evolve a special method to get
rid of "excess" sulphur, when another creature, a mammal, say a protoshrew,
which eats the same targtet food, does not appear to have to evolve a
mechanism to do this.

Or, if you like, why do vultures need this mechanism and say, hyenas don't?