Alex Mustard / A group of Florida manatees (Trichechus manatus latirostrus) sleeping in the afternoon at Three Sisters Spring. Manatees sleep on the bottom of this shallow spring, occasionally rising to the surface...

Claudio Contreras / Northern elephant seal (Mirounga angustirostris) weaner sleeping at the bottom of a tide pool, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, April

Jeff Rotman / Mouth of Banded Wobbegong shark (Orectolobus ornatus) Perth, Australia - Indian Ocean.

Jeff Rotman / Nostril and mouth parts of Bamboo shark (Chiloscyllium punctatum) Perth, Australia, Indian Ocean

Jeff Rotman / Whitetip Reef sharks (Triaenodon obesus) following scent trail in water column, Cocos Island, Costa Rica, Pacific Ocean.

Jeff Rotman / Whitetip Reef Sharks (Triaenodon obesus) following scent trail in water column, Cocos Island, Costa Rica, Pacific Ocean.

Suzi Eszterhas / Juvenile Chimpanzee (Pan troglodytes) climbing in vines. Tropical forest, Western Uganda.

Georgette Douwma / False fire urchin (Astropyga radiata) grouped on sandy bottom. Lembeh Strait, North Sulawesi, Indonesia.

Chadden Hunter / Dallol hot springs where water heated by magma laden with potassium, sulphur and iron spews up through salt pans staining the salt deposits with vivid colours, in the bottom of the Rift Valley, 120 me...

Wild Wonders of Europe / Roggo / Barbel (Barbus barbus) feeding at the bottom of a pool, Sense river, Fribourg, Switzerland, June 2008

Jeff Rotman / Bottlenose Dolphin (Tursiops truncatus) feeding in sandy bottom of seabed, Red Sea, Egypt

Wild Wonders of Europe / Zankl / Hard bottom community off Comina Island, Malta, Mediteranean, May 2009