Tim Laman / Head portrait of a Wild Western / Sunda tarsier (Tarsius bancanus) on tree trunk at night. Danum Valley Conservation Area, Borneo, Sabah, Malaysia

Tim Laman / Young boy aged 7 (model released) watching a Wild Western / Sunda tarsier (Tarsius bancanus) on tree trunk at night. Danum Valley Conservation Area, Borneo, Sabah, Malaysia, July 2007

Ross Hoddinott / Common blue tailed damselfly {Enallagma cyathigerum} peering out from behind stem. Tamar lake, Cornwall/Devon, UK. August.

Jean-Pierre Zwaenepoel / Southern plains grey / Hanuman langur {Semnopithecus dussumieri} juvenile standing, looking out, Thar desert, Rajasthan, India

Jabruson / Potto (Perodicticus potto ibeanus) in day nest hole in tree Zaire Epulu, Ituri Rainforest Reserve

Yashpal Rathore / Bengal tiger (Panthera tigris tigris) nervous cub, aged less than two month old, at night approaching lying in waterhole, Kanha National Park, Central India. Camera trap image.

David Perpinan / Stomatitis in a captive Chinese water dragon (Physignathus cocincinus). This is a common condition in captive water dragons, as they are nervous and hit themselves against glass.

Frederique Olivier / Nervous juvenile Adelie penguin (Pygoscelis adeliae) looking around, Antarctica.

Steven Kazlowski / Polar bear (Ursus maritimus) approaching another bear shows its nervousness by rubbing its face, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska

Steven Kazlowski / Polar bear (Ursus maritimus) approaching another bear shows its nervousness by rubbing its face, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska

Carol Walker / Wild horse / mustang called Mica, rounded up from Adobe Town Herd Management Area in Wyoming and adopted by photographer Carol Walker. Wearing a saddle for the first time, with trainer Rich Scott. Col...

Rod Williams / Southern mitered langur (Presbytis melalophos mitrata) South East Sumatra, endangered species. Captive.