Bernard Castelein / Bearded Dwarf Chameleon (Rhampholeon brevicaudatus) crawling over leaf litter, Jozani Chwaka Bay NP, Zanzibar, Tanzania

Magnus Lundgren / Wild Wonders of China / Camouflaged shrimp in a hydroid, Kenting National Park, Hengchun Peninsula of Pingtung County, Taiwan

Magnus Lundgren / Wild Wonders of China / Stingray eye in the sand, close up, Kenting National Park, Hengchun Peninsula, Taiwan

Roland Seitre / Young Brown Throated Three Toed Sloth (Bradypus variegatus) at the sloth orphanage. Aviarios del Caribe Sloth Refuge, Costa Rica, 2008.

Roland Seitre / Brown-throated Three-toed Sloth (Bradypus variegatus) by tree trunk, showing the bark-mimicking colouration of its fur. Captive. Aviarios del Caribe Sloth Sanctuary, Costa Rica.

Roland Seitre / Brown-throated Three-toed Sloths (Bradypus variegatus) hanging from a tree trunk, demonstrating bark-mimicking colouration. Captive. Aviarios del Caribe Sloth Sanctuary, Costa Rica.

Bernard Castelein / Tree Gecko (Hemidactylus platycephalus) camouflaged on tree trunk, Jozani Chwaka Bay NP, Zanzibar, Tanzania

Robert Thompson / Sweet gale moth (Acronicta euphorbiae) camouflaged on stone wall, Lough Gealain, Burren National Park, County Clare, Republic of Ireland, May