A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The cat brain weighs about 30g.
167
The station master and operating officer at the Kishi Station, Japan, is a cat!
18
The Platypus used to be considered a myth like Bigfoot and the Yeti.
18
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
8
The seahorse is the only fish to have a neck.
12
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17