Jack Perks / Ballan wrasse (Labrus bergylta) adult entering frame, investigating cave entrance, changing colour through metachrosis and leaving frame, Swanage Pier, Dorset, England, UK, English Channel, September.

Inaki Relanzon / Two Gentoo penguins (Pygoscelis papua) a chick chasing the adult for food, Falkland Islands, Atlantic Ocean.

Tim Laman / Dusky titi monkey (Callicebus discolor) sub-adult, feeding on fruit, Tiputini Biodiversity Station, Orellana Province, Ecuador.

Emanuele Biggi / Lovely poison-arrow frog (Phyllobates lugubris) sitting on mud with tadpoles on back, Escudo de Veraguas island, Panama.

Emanuele Biggi / Grey foam-nest tree frog (Chiromantis xerampelina) sitting in hotel room, Zambia.

Emanuele Biggi / Close-up of spots on skin of Fire salamander (Salamandra salamandra), Aveto Regional Park, Italy.

Emanuele Biggi / Gardiner's frog (Sechellophryne gardineri) sitting on leaf, Mahè Island, Seychelles.

Emanuele Biggi / Close-up of Strinati's cave salamander's (Speleomantes strinatii) eye, San Bartolomeo di Savignone, Italy

Emanuele Biggi / Close-up of Gunther's banded treefrog's (Boana fasciata) eyelids, which help with camouflage, Los Amigos Biological Station, Peru.

Emanuele Biggi / Beaked frog (Rhinella sp.) sitting on leaf on forest floor and looking around, Los Amigos Biological Station, Peru.

Emanuele Biggi / Frog (Pristimantis sp.) sitting on leaf and looking forward, Kosnipata Valley, Peru.

Emanuele Biggi / Lemur leaf frog (Agalychnis lemur) resting on leaf and looking around, Veragua rainforest, Costa Rica.