Female cats also fight over territory or to defend their kittens. Domestic cats, especially young kittens, are known for their love of play. It is commonly used by mother cats calling their kittens inside the nest. Gibson and Walk performed identical experiments with chicks, turtles, rats, kids, lambs, kittens, and puppies. Litter size varies between two and three kittens. Coyotes have killed adult bobcats and kittens. Tail length is random throughout a litter of kittens. They had one to six kittens per litter, with an average of three kittens. The chapter begins with footage of ducklings, kittens, piglets, and geese. Animal welfare groups made statements saying that bonsai kittens were not real. A mew is a high-pitched meow often produced by domestic kittens. Males can father kittens from as young as five months to over ten years. Crusoe lets Sam and her kittens run wild. The male then leaves and is not involved in raising the kittens. Not all Mau kittens are registered.