Open water swimmers are fully aware of the danger of sharks, jellyfish, orcas, sea snakes, needlefish, giant squid, polar bears, leopard seals, hippos and piranha.

They also know about the dangers of swimming with alligators and crocodiles.

Found in many rivers and lakes in Africa and in the southern parts of the United States, these reptiles are patient and are ambush predators.

It is difficult to see them – because most rivers and lakes are murky.

But they also climb trees.

Photograph by Kristine Gingras.

Copyright © 2014 by World Open Water Swimming Association