Anup Shah / Bornean Orangutan (Pongo pygmaeus wurmbii) mature male 'Tom' close-up portrait showing cheek pad eyes and nose. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia. June 2...

Juergen Freund / Spine-cheek anemonefish (Premnas biaculeatus) with baby amongst anemone tentacles, Bali, Indonesia, Indo-pacific.

Peter Cairns / 2020VISION / Pair of Gannets (Morus bassanus) mutual preening, Bass Rock, Firth of Forth, Scotland, UK, June. Photographer quote: 'I never get tired of watching gannets. This pair who momentarily lined up in perfe...

Edwin Giesbers / Portrait of Eurasian Jay (Garrulus glandarius) showing colouring on cheek and primary flight feathers. The Netherlands, June.

John Cancalosi / Golden-mantled ground squirrel (Spermophilus lateralis) with very full cheek pouches. Montana, USA, Oct 2010

Tui De Roy / Streaked tuftedcheek ( Bellavista cloud forest private reserve, 1700m altitude, Tandayapa Valley, Andean cloud forest, West slope, Tropical Andes, Ecuador

Tui De Roy / Streaked tuftedcheek (Pseudocolaptes boissonneautii) bird, Bellavista cloud forest private reserve, 1700m altitude, Tandayapa Valley, Andean cloud forest, West slope, Tropical Andes, Ecuador

Loic Poidevin / Great Egret (Casmerodius / Ardea alba / alba) scratching its cheek with long foot. Breton Marsh, French Atlantic Coast, September.

Christian Ziegler / Greater Bulldog Bat (Noctilio leporinus) feeding on a small fish, Smithsonian Tropical Research Station, Barro Colorado Island, Panama

Birgitte Wilms / Spine-cheek Anemonefish (Premnas biaculeatus) in anemone, Solomon Islands

Juergen Freund / Red-cheek / threadfin anthias (Pseudanthias huchtii). Misool, Raja Ampat, West Papua, Indonesia.

Jane Burton / Retriever-cross puppies sitting cheek to cheek.