In 132 AD, a Chinese inventor built a seismograph which, at the moment of an earthquake, expelled a copper ball out of the mouth of a dragon and into the mouth of a frog.

Jean Cousin has been said to have discovered the New World in 1488, four years before Christopher Columbus, when he landed in Brazil around the mouth of Amazon, but this remains unproven.

A naked mole rat’s four front teeth are located outside its mouth, and their lips are sealed just behind the teeth, preventing soil from filling its mouth while he is digging.

The Kindlifresser, or “Child Eater”, is one of oldest statues in Bern, Switzerland, and nobody is sure why it has a baby half stuffed into his mouth, and three more over its shoulder.