Edwin Giesbers / Saltwater crocodile (Crocodylus porosus) close up portrait, Sarawak, Borneo, Malaysia

Morley Read / Slow motion clip of a Forest whiptail lizard (Kentropyx pelviceps) blinking its eye, showing nictitating membrane crossing the eye, Amazon rainforest, Orellana Province, Ecuador. (non-ex)

Morley Read / Clown treefrog (Dendropsophus reticulatus) opening its eyes, Amazon rainforest, Orellana Province, Ecuador. (non-ex)

Andy Rouse / Bengal tiger (Panthera tigris) male, sub-adult aged three years, face portrait. Ranthambhore National Park, India.

Shane Gross / Caribbean reef shark (Carcharhinus perezi), two from below, one close up. Caribbean Sea off Gardens of the Queen National Park, Cuba.

Morley Read / Leaf frog (Agalychnis hulli) blinking its eyes and turning around, Orellana Province, Ecuador. (non-ex)

Karine Aigner / Bengal tiger (Panthera tigris tigris) head, close up. Ranthambore National Park, Rajasthan, India.

Thomas Marent / Buckley's Slender-legged Treefrog (Osteocephalus buckleyi), Putumayo, Colombia

Paul Williams / Sumatran tiger (Panthera tigris sumatrae) close up portrait, captive.

Staffan Widstrand / Wild Wonders of China / Portrait of a Golden snub-nosed monkey (Rhinopithecus roxellana) full frame of the face, Foping Nature Reserve, Shaanxi, China. Endangered species

Phil Savoie / Pink lady mayfly (Epeorus albertae) close up of eye of male, Madison River, Montana, USA, August.

Theo Bosboom / Small red damselfly (Ceriagrion tenellum) close up portrait, warming up in the early morning. De Hatertse Vennen Nature Reserve, near Nijmegen, the Netherlands, July.