Laurent Geslin / Mass of Wildebeest {Connochaetes taurinus} scrambling to get out of the river during the great migration, Masai Mara reserve, Kenya, July

Eric Baccega / Eastern White-bearded Wildebeest herd (Connochaetes taurinus) crossing the Mara River. Masai Mara National Reserve, Kenya.

Tui De Roy / Kakapo (Strigops habroptilus) scrambling through scrub in search of berries. Codfish/Whenua Hou Island, New Zealand.

Tui De Roy / Kakapo (Strigops habroptilus) scrambling through scrub in search of berries. Codfish/Whenua Hou Island, New Zealand.

David Pattyn / Dalmatian pelicans (Pelecanus crispus) scrambling to catch fish, Lake Kerkini, Greece, February

Tui De Roy / Kakapo (Strigops habroptilus) flightless nocturnal parrot, hand-reared, scrambling through scrub in search of berries, Codfish Island, Whenua Hoa, New Zealand

Tui De Roy / Kakapo (Strigops habroptilus) flightless nocturnal parrot, hand-reared, scrambling through scrub in search of berries, Codfish Island, Whenua Hoa, New Zealand

Chien Lee / Scorpion Orchid (Arachnis flos-aeris) frequently seen growing epiphytically along rivers where its long scrambling stems hang over the water, Lubang Buaya, Batang Ai National Park, Malaysia

Clay Bolt / Frigid bumble bee (Bombus frigidus) nectaring on plants in tundra. Denali National Park, Alaska, USA.

Tui De Roy / Olive ridley turtle (Lepidochelys olivacea) hatchlings emerging from nest at dusk scrambling to return to the sea, Ventanilla Beach, Oaxaca, Mexico.

Mike Read / White bryony (Bryonia cretica) scrambling over a dock plant, St Catherine's Hill Nature Reserve, Hampshire and Isle of Wight Wildlife Trust Reserve, Winchester, Hampshire, England, UK, July.