Original kitty litter was made out of sand but it was replaced by more absorbent clay in 1948.

Original kitty litter was made out of sand but it was replaced by more

More from the Animal Facts niche...

Animal Facts

Newborn kittens have closed ear canals that don’t begin to open for nine

Animal Facts

When a cat flops over and exposes his belly, it’s not always an

Animal Facts

Obesity is the top health problem among dogs

Animal Facts

The shape of a dog’s face suggests its longevity: A long face means a

Animal Facts

When a cat swishes its tail back and forth, she’s concentrating on

Animal Facts

Talk about Facetime: Cats greet one another by rubbing their noses