Jerry Monkman / Researchers searching for freshwater mussels in the Ashuelot River, Keene, New Hampshire, USA, September 2006.

Juergen Freund / Charlotte Watson snorkels down to collect sand which may contain polychaete worms, Coral Reef census, Lizard Island, Queensland, Australia, April 2008. Model released

Richard Du Toit / African Elephant (Loxodonta africana) group using trunks as snorkels while swimming across the Chobe River, Chobe National Park, Botswana