Philippe Clement / Lynx (Lynx lynx) sharpening claws on tree trunk before walking away, Germany, May. Captive

Edwin Giesbers / Lynx (Lynx lynx) stretching and sharpening claws, Germany, July. Captive.

Philippe Clement / Lynx (Lynx lynx) stretching and sharpening claws on fallen tree trunk, Isselburg, Germany, October. Captive.

Francois Savigny / Male Bengal tiger sratching tree {Panthera tigris tigris} Bandhavgarh NP, India - sharpening claws and marking his territory

Christophe Courteau / Lion (Panthera leo) male sharpening his claws on a tree at night, Sabi Sand Game Reserve, South Africa.

Yukihiro Fukuda / Feral domestic rabbit (Oryctolagus cuniculus) sharpening claws, Okunojima Island, also known as Rabbit Island, Hiroshima, Japan.

George McCarthy / Male Elk (Cervus canadensis) thrashing vegetation to sharpen antlers during the autumn rutting period, Yellowstone National Park, USA

Pete Cairns / European Lynx (Lynx lynx) adult female using tree as scratching post to sharpen claws. Bardu, Norway, captive

Marie Read / Adult American oystercatcher (Haematopus palliatus) attacking juvenile Great black-backed gull (Larus marinus) on beach. Long Island, New York, USA. June. Topaz AI Sharpen applied.

Marie Read / Male Downy woodpecker (Picoides pubescens) taking off from moss-covered trunk in winter, with orange foliage in background. Freeville, New York, USA. December. Topaz AI DeNoise and Sharpen applied...

Marie Read / Pair of Evening grosbeaks (Coccothraustes vespertinus), in winter plumage, perched on moss-covered log. New York, USA. October. Digitally retouched; distractions removed. Topaz AI Sharpen applied.

Marie Read / Male Evening grosbeak (Coccothraustes vespertinus), in winter plumage, perched on moss-covered log. New York, USA. October. Digitally retouched; distractions removed. Topaz AI Sharpen applied.

Marie Read / Male Black-throated blue warbler (Setophaga caerulescens) perched in flowering Serviceberry (Amelanchier). Salamanca, New York. May. Topaz AI DeNoise and Sharpen applied.

Marie Read / Male Downy woodpecker (Picoides pubescens) taking off to avoid Male Hairy woodpecker (Picoides villosus) that landed on its perch in winter, with orange foliage in background. Freeville, New York, U...

Marie Read / Adult Piping plover (Charadrius melodus) flying along shoreline. Northern Massachusetts coast, USA. April. Topaz AI Sharpen applied.

Marie Read / Adult Least tern (Sterna antillarum) sitting with two chicks, one begging in anticipation of being fed. Long Island, New York, USA. June. Topaz AI Sharpen applied.

Marie Read / Arctic tern (Sterna paradisaea) flying over field of Lupines (Lupinus). Keflavik, Iceland. July. Topaz AI Sharpen applied.

Ann & Steve Toon / Male Cheetah (Acinonyx jubatus) sharpening claws against a tree trunk, Kgalagadi Transfrontier Park, Northern Cape, South Africa.