A group of kittens is called a "kindle".
10
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
When cats are happy, they may squeeze their eyes shut.
10
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
23
The octopus does not have a blind spot.
273
A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293