Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) cruising along the drop off of a coral reef. Bloody Bay Wall, Little Cayman, Cayman Islands. Caribbean Sea. NB. Turtle has two identification tags in its fron...

Loic Poidevin / Sheep (Ovis aries) flock herded together with ear tags and paint markings. Ossoue valley, French Pyrenees, September.

Alex Hyde / Peacock Mantis (Pseudempusa pinnapavonis) against white background. Captive, endemic to Africa.

Inaki Relanzon / Trashumancia / seasonal migration, large herd of moving livestock, French Pryrenees, Spain, June 2011.

John MacPherson / 2020VISION / Bottlenose dolphin (Tursiops truncatus) surfacing, fin showing distinctive identifying marks, Moray Firth, Inverness-shire, Scotland, UK, August

Doug Perrine / Researcher Guy Stevens photographs belly spot identification pattern of Reef manta ray (Manta alfredi formerly Manta birostris) feeding on plankton, Hanifaru Bay, Baa Atoll, Maldives, Indian Ocean, Oc...

Christophe Courteau / Photo-identification of Jaguars (Panthera onca) for scientific Research, Pantanal, Brazil, September 2008

Christophe Courteau / Jaguar (Panthera onca palustris) wild pregnant female, in undergrowth beside the Cuiaba River, Pantanal, Mato Grosso, Brazil, September 2008. This individual is called BORBOLETTA by researchers (pho...

Christophe Courteau / Jaguar (Panthera onca palustris) wild pregnant female, in undergrowth beside the Cuiaba River, Pantanal, Mato Grosso, Brazil, September 2008 This individual is called BORBOLETTA by researchers (phot...

Peter Cairns / naturepl.com / Close up of leg rings on Eurasian Crane (Grus grus), Hornborga, Sweden, April

Solvin Zankl / Collection of beetles from the Namib desert, Namibia

Shin Yoshino / Black-tailed Prairie Dog (Cynomys ludovicianus) pair touching noses for identification, Colorado