Cats recognise the voice of their owner, but never evolved to care.
22
Whales and dolphins can't taste anything other than salt.
11
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6