Edwin Giesbers / Western lowland gorilla (Gorilla gorilla gorilla) twin babies age 45 days sleeping in mother's arms, captive, occurs in Central Africa. Critically endangered.

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) infant male 'Gizmo' aged 2 years, portrait. Gombe National Park, Tanzania.

Anup Shah / Eastern chimpanzee (Pan troglodytes schweinfurtheii) adult male 'Frodo' aged 35 years portrait. Gombe National Park, Tanzania.

Solvin Zankl / Sargassumfish (Histrio histrio) swimming near Broad-toothed gulfweed (Sargassum fluitans) Sargassum Community. Sargasso Sea, Bermuda.

Jabruson / Boy carrying bushmeat to market, Black-fronted Duiker (Cephalophus nigrifrons). Mbomo, Odzala-Kokoua National Park, Democratic Republic of Congo.

Juergen Freund / Andamooka opals held in hand, South Australia, June 2011

Cheryl-Samantha Owen / Black footed penguin (Spheniscus demsersus) chick hatching inside a small incubator at the Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) which collects abandoned eggs fro...

Petra Wegner / Guinea Pig (Cavia porcellus) black and white short coated, in wooden feeding rack, on garden lawn, being fed carrot. Model rleased

Steve Gettle / Black-capped Chickadee (Poecile atricapillus) on child's hand, Kensington Metropark, Michigan

Mark Carwardine / Black rhinoceros (Diceros bicornis) calf, hand reared, Endangered species, Mkhaya Game Reserve, Swaziland

Juergen Freund / Fred Gurgel organizing his algae / seaweed specimens, as part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008

TJ Rich / Portrait of male silverback Western Lowland gorilla {Gorilla gorilla gorilla} with fingers in mouth UK