David Perpinan / Great rufous woodcreeper (Xiphocolaptes major) arriving at nest site in a dead palm tree, climbs down to nest, Pantanal, Mato Grosso do Sul, Brazil.

Andy Rouse / Coquerel's Sifaka (Propithecus coquereli) climbing tree, Palmarium Reserve, Madagascar

Andy Rouse / Coquerel's Sifakas (Propithecus coquereli) in coastal rainforest, Palmarium Reserve, Madagascar

Jerry Monkman / A man climbs "Top of the Prow" rock on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Jerry Monkman / A man climbs "Top of the Prow" rock on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Constantinos Petrinos / Veined octopus inside shell {Octopus marginatus}, Lembeh Strait, N Sulawesi, Indonesia. Shells are found in the seabed and dug up and cleaned by octopus, which then climbs inside for protection.

Jabruson / Mbuti pygmy climbs forest tree. Epulu forest reserve, Dem Rep of Congo, Central Africa

Neil Aldridge / Orphaned Temminck's ground pangolin (Smutsia temminckii) climbs on to the boot of an anti-poaching guard while foraging during rehabilitation at the Rhino Revolution facility in South Africa. This...

David Perpinan / Pair of Red-bellied macaws (Orthopsittaca manilata) perched near nest, one climbs out of shot, Pantanal, Mato Grosso do Sul, Brazil.

Alex Mustard / Basket star (Gorgonocephalus eucnemis) climbs up on red soft coral (Eunephthya rubiformis) to feed during daylight. Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada. Queen Charlot...

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) chick wading in a tide crack, turns around and climbs out, Adelie Land, Antarctica, January.

Steve Downer / Coot (Fulica atra) chick at edge of nest, adult approaches with food and climbs onto nest, Birmingham, England, UK, June.