David Perpinan / Overgrown claw damaging the foot pad in a captive jaguar (Panthera onca)

Graeme Guy/ BIA / Bridled Nail-tailed Wallaby (Onychogalea fraenata), Queensland, Australia

Ashley Cooper / Sheep dog wearing nail studded collar for protection from wolves. Picos de Europa National Park, Spain, June 2005

Roland Seitre / Bridle nail-tailed wallaby (Onychogalea fraenata) portrait, Australia. Captive. Endangered species.

Roland Seitre / Bridled Nail-tailed Wallaby (Onychogalea fraenata), Australia

Roland Seitre / Platypus (Ornithorhynchus anatinus) male venomous spur, native to Australia

Cyril Ruoso / Common Wombat (Vombatus ursinus) portrait, southeastern Australia

Roland Seitre / Hoffmann's Two-toed Sloth (Choloepus hoffmanni) hand next to human hand, Aviarios Sloth Sanctuary, Costa Rica

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