Whales and dolphins can't taste anything other than salt.
11
Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
4
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 Basenji dog is the only dog that is not able to bark.
4