A female cat can begin mating when she is between 5 and 9 months old. A male cat can begin mating when he is between 7 and 10 months old. A group of kittens is called a kindle. If left to her own devices, a female cat may have three to seven kittens every four months. This is why population control using spaying and neutering is so important.
Cats have over one hundred vocal sounds, while dogs only have about ten.
Most cats have five toes on each front paw, but only four toes on each back paw. You can tell a cat's mood by looking into its eyes. A frightened or excited cat will have large, round pupils. An angry cat will have narrow pupils. The pupil size is related as much to the cat's emotions as to the degree of light.