Daniel Nunez / Jumping pit viper (Metlapilcoatlus mexicanus) resting, portrait, Caribbean Slope of Guatemala, Sierra Caral Reserve, Izabal, Guatemala.

Andy Sands / Slime mould (Stemonitis sp.) newly emerged bright yellow sporangia on rotting log, Buckinghamshire, England, UK. September. Focus stacked.

Andy Sands / Wrinkled peach fungus (Rhodotus palmatus), young fungus growing from Elm log showing characteristic guttation, Hertfordshire, England, UK. November. Focus stacked.

Andy Sands / Holly parachute fungus (Marasmius hudsonii) young 2mm tall fungus after rain, with water droplets caught among hairs, Buckinghamshire, England, UK. November. Focus stacked.

Alex Mustard / Close up showing the colours and textures of the curling arms of a Crinoid on a coral reef, Anilao, Batangas marine protected area, Luzon, Philippines, Pacific Ocean.

Alex Mustard / Pygmy lemon gobies (Lubricogobius exiguus) pair, guarding their home in a glass bottle, Batangas marine protected area, Luzon, Philippines, Verde Island Passages, Pacific Ocean.

Alex Mustard / Coleman shrimps (Periclimenes colemani) pair, female on right, camouflaged in their Fire urchin (Asthenosoma varium) home, Batangas marine protected area, Luzon, Philippines. Verde Island Passages, Pa...

David Perpinan / Catalan chub (Squalius laietanus) shoal swimming around close to the riverbed. The fish enter and leave frame. Besos river, Barcelona, Spain. October.

Bernard Castelein / Speckled bush cricket (Leptophyes punctatissima) resting on leaf, Brasschaat, Belgium. August.

Joel Sartore / Photo Ark / Usambara three-horned chameleon (Trioceros deremensis) looking around, Tiergarten Schonbrunn, Vienna. Captive.

Joel Sartore / Photo Ark / East African green mamba (Dendroaspis angusticeps) looking and flicking its tongue, Kentucky Reptile Zoo, Kentucky. Captive.

Joel Sartore / Photo Ark / Eastern diamondback rattlesnake (Crotalus adamanteus) looking and flicking its tongue, Kentucky Reptile Zoo, Kentucky. Captive.