Do you know why cats are known as the perfect carnivore? That's because their whole being is designed for hunting and eating animal flesh, from their claws and teeth to their digestive system. Young kittens are taught by their mothers that mice and birds are good to eat. Kittens have a natural instinct to chase and catch fast moving small items. It's a natural predatory behavior which forms an important survival skill. While I was out the other day, I came across this stray kitten who was playing with a mouse it's mother must have probably caught and given as a part of the kitten's training process.