A group of unicorns is called a blessing.
304
Cows can sleep standing up, but they can only dream lying down.
745
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
Jellyfish as a species are actually older than dinosaurs and sharks.
383
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23