Mark Carwardine / Bowhead whale (Balaena mysticeus) surfacing, showing distinctive profile, Igloolik, Foxe Basin, Nunavut, Arctic Canada

Brent Stephenson / Hector's dolphins (Cephalorhynchus hectori) breaking the surface showing the distinctive patterning and rounded dorsal fins. Akaroa Harbour, Canterbury, New Zealand.

Brent Stephenson / Hector's dolphin (Cephalorhynchus hectori) breaking the surface as it breathes showing the distinctive patterning and rounded dorsal fin. Akaroa Harbour, Canterbury, New Zealand.

Bertie Gregory / 2020VISION / Young Red fox (Vulpes vulpes) investigating a remote controlled camera in urban park, Bristol, UK, February. Did you know? Red foxes have distinctive body language, and inquisitive foxes will flick t...

Brent Stephenson / Cape petrel (Daption capense) in flight showing the distinctive upperwing pattern. Kaikoura, Canterbury, New Zealand, October.

Nick Upton / Parasite fly / Tachinid fly (Prosena siberita) with distinctive long proboscis, resting on Woolly thistle leaf (Cirsium eriophorum), chalk grassland meadow, Wiltshire, UK, July.

Matthias Breiter / African Jacana (Actophilornis africanus) walking on water lily pads showing distinctive large feet, Okavango Delta, Botswana

Christian Ziegler / Leaf damaged by insect larva with a distinctive feeding pattern, Barro Colorado Island, Panama

Andrew Parkinson / Female Blackbird (Turdus merula) feeding on a distinctive, yellow variety of rowan, January, Nottinghamshire, UK

Andrew Parkinson / Male Blackbird (Turdus merula) perched in a distinctive, yellow variety of rowan, January, Nottinghamshire, UK

Linda Pitkin / 2020VISION / Brown Trout (Salmo trutta) in disused quarry, Jackdaw Quarry, Capernwray, Carnforth, Lancashire, UK, August. Photographer quote: 'Mature male brown trout have large jaws and, like salmon, sometimes de...

Bryan and Cherry Alexander / Distinctive Bautaen Mountain, ground to this sharp horn shape by glaciers. Hornsund Fjord. Spitsbergen, Svalbard, Norway, June 2008.