An annoyed camel will spit at a person.
The giant squid has the biggest eyes of any animal: its eyes measure 40 cm (16 in) in diameter.
Fish and insects do not have eyelids – their eyes are protected by a hardened lens.
Domestic cats purr at about 26 cycles per second, the same frequency as an idling diesel engine.
Mammals are the only animals with flaps around the ears.