Cyril Ruoso / Ring-tailed Lemur (Lemur catta) basking, Anja Park, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) basking, Anja Park, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) trio basking, Anja Park, Madagascar

Sven Zacek / Bearded seal (Erignathus barbatus) sunbathing on iceberg broken off from glacier. Kongsfjorden fjord, Spitsbergen, Norway. June 2014.

Nick Hawkins / Marine iguana (Amblyrhynchus cristatus) basking on volcanic rock at coast. Isabela Island, Galapagos.

Gavin Hellier / Timelapse of beachgoers on Ipanema Beach, with Dois Irmaos mountain in the background, Rio de Janeiro, Brazil, September 2016. Hellier

Gavin Hellier / Timelapse of beachgoers on Ipanema Beach at sunset, with Dois Irmaos mountain in the background, Rio de Janeiro, Brazil, September 2016. Hellier

Nick Upton / Adult Herring gull (Larus argentatus) walking among sunbathers on beach, St.Ives, Cornwall, UK, June. Editorial use only.

Aflo / Cat stretching forward whilst sunbathing, Hofu, Yamaguchi, Japan.

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) male warming himself in the sun, vulnerable, Madagascar

Konrad Wothe / Southern Cassowary (Casuarius casuarius) female walking near tourists on beach, Moresby Range NP, Queensland, Australia, November 2010

Luiz Claudio Marigo / Two Giant Otter / Giant Brazilian Otter (Pteronura brasiliensis) sunbathing on a tree trunk. The Pantanal wetlands of Mato Grosso State, Brazil, October.