According to Wikipedia, “liquid takes the shape of a container” and maintains “almost-fixed volume.” So based on that definition, it’s easy to prove that cats must be liquids. If you’ve ever seen a cat squeeze into a tight spot, you can verify that this fact is true. Otherwise you can see undeniable photographic proof that cats can take the shape of any container just like liquid can do,

To view photographic evidence that cats must be liquids, click here.