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.

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