A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Cats recognise the voice of their owner, but never evolved to care.
22
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
Parrot parents "name" their children with a signature call.
112
Sheep, goats, octopuses, and toads have rectangular pupils.
7
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23