On CNN today: http://www.cnn.com/2005/TECH/science/07/25/feline.sweet.gene.ap/index.html I'm not sure there is any other mammal as 'entirely' a carnivore as the felines -- of all sizes. Dogs, bears, even foxes, will eat lots of things besides meat. But cats almost always won't. The article linked above discusses the finding that cats have a gene that has mutated to become inoperable -- the gene that turns on the sweet receptors enabling the animal to taste sweets. Cats don't have it. Those who decry the reality of Noah's Ark and ask either how some mammals became carnivores after or survived before or during the year on the water have seemed to have a point. My response has been that there were plants before which had the high protein/amino acid content todays carnivores need. Indeed, we have plants today which may well be reminiscent of that, such as soy. This article about cats and their dysfunctional gene, however, offers an additional bit: again loss of function due to a mutation. And again, mutations do exactly that -- cause loss of function, not a gain in function. This is just another one. Once upon a time, cats were different. Of course this is the straightforward explanation. Watch your nearest evolutionist apologist for a twist which will try to support evolution.