A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
There's a lizard known as the 'Jesus Lizard' that can run across water.
11
On some poorly researched trivia lists it is stated as a fact that a pregnant goldfish is called a twit. This is not true as goldfish lay eggs.
71
Cats and dogs can hear ultrasound.
350
The octopus does not have a blind spot.
273