Kittens’ eyes are usually blue at birth, but can later change to brown, orange, green, or amber. You can usually tell what color they will be when the kitten is around three months old.

A kitten with green fur was discovered in Denmark in 1995. It was thought to be a genetic mutation, but the unusual color was actually caused by high levels of copper in the water supply.

Cats have more than 100 sounds in their vocal repertoire, while dogs have ten. A cat’s cerebral cortex is more complex than a dog’s.

Cats have around 300 million neurons, almost twice that of dogs. (and they know it, too!) Maybe this is why they so obviously consider themselves superior to dogs!