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carnivores descended from hrbivores.
There are plenty among the i nvertebrates, though I can't think of
among terrestrial vertebrates. Several genera of grasshoppers
are carnivorous. Many carnivorous fish seem to be descended
from herbivorous ancestors. An example would be some of the
Tilaliids, amongs which the primitive mode of feeding was on
algae. Many are now carnivorous, including the mosquitoe fish,
introduced into Lousiana to keep mosquito larvae i n check
in catfish ponds and crawdad ponds.
>From: David Brez Carlisle