Fergus Gill / 2020VISION / Male Corncrake (Crex crex) South Uist, Outer Hebrides, Scotland, UK, June. Did you know? Corncrakes make a rasping call which sounds like a nail scraped along a comb.

Simon Colmer / Lime nail / bugle galls on Lime leaf caused by Gall mite (Eriophyes tiliae) Sussex, UK, July

Simon Colmer / Lime nail / bugle galls on Lime leaf caused by Gall mite (Eriophyes tiliae) Sussex, UK, July

Simon Colmer / Lime nail / bugle galls on Lime leaf caused by Gall mite (Eriophyes tiliae) Sussex, UK, July

Dave Watts / Bridled Nail-tail Wallaby {Onychogalea fraenata} Queensland, Australia. Endangered species

Pete Oxford / Thiel's pygmy / Thumb-nail / dwarf chameleon (Brookesia thieli) Central-eastern rainforests of MADAGASCAR, endemic

Pete Oxford / Thumb-nail / dwarf chameleon (Brookesia stumpffi) Montagne d'Ambre National Park, rainforest, Northern MADAGASCAR, endemic

Pete Oxford / Thumb-nail / Stump tailed / dwarf chameleon (Brookesia decaryi) camouflaged in leaf litter, near Andringitra Massif, South-central MADAGASCAR, endemic

Jane Burton / Nail clippers, to trim dog claws

Nick Garbutt / Close-up of underside of foot of Indian elephant {Elephas maximus} Kanha NP, India

Nick Garbutt / Close-up of foot of Indian elephant {Elephas maximus} captive, India

Norbert Wu / Small-toothed Rock Hyrax (Heterohyrax brucei) closest living relative of Elephant, feet possess hoof-like nail, Kenya

Ingo Arndt / Hoffmann's Two-toed Sloth (Choloepus hoffmanni) detail of claws and foot

Ingo Arndt / Hoffmann's Two-toed Sloth (Choloepus hoffmanni) detail of claws and foot

Ingo Arndt / Siberian Tiger (Panthera tigris altaica) detail of cub's paw with claws extended

Ingo Arndt / European Mole (Talpa europaea) close up of paw. Dead specimen.

Ingo Arndt / Eastern Grey Kangaroo (Macropus giganteus) detail of foot

Ingo Arndt / Eurasian Red Squirrel (Sciurus vulgaris) detail of foot

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) three long hind flipper with vestigious toenails, St Paul Island, Pribilof Islands, Alaska

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) detail of cub's paw showing claws, holding a bamboo shoot at the China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China

Paul D Stewart / Illustration of 'Horn of the Iguanodon' (3) and 'The Claw or unguical bone of an Iguanodon' (1) with, for comparison 'The Nail and the bone which it covered of a recent Iguana' (2, 3). Drawn and litho...

Onne van der Wal / Man hammering nail into traditional Beetle cat in Padanaram, Massachusetts. Designed in 1921 by Carl Beetle in MA, these gaff-rigged dinghies continue to be built and remain an active and popular one-...

Vivek Menon / Elephant nail trap for rering elephant lame {Elephas maximus} South India