rhinoceros

A rhinoceros is so massive that if it falls asleep on its legs, blood flow could be cut off, leading to circulatory problems and significant injury.

The animals said to have been featured in various Roman spectacles include hippopotamuses, elephants, rhinoceroses, bears, ostriches and big cats like lions and tigers.

There are "heavily armed gladiators riding a charging rhinoceros" and "wounded men tumbling from boats into the jaws of ravenous sharks" during the nautical battle staged in the flooded pit of the Colosseum.

It was the ninth Banksy to appear in as many days in London and follows images of a goat, elephants, monkeys, a wolf, pelicans, a cat, piranhas and a rhinoceros.

His latest work follows images that have popped up each morning since 5 August across London of a goat, elephants, monkeys, a wolf, pelicans, a cat, piranhas and a rhinoceros.