Doug Gimesy / Rear left ankle of a male platypus (Ornithorhynchus anatinus) held by a researcher showing venomous spur. Dartmouth, Victoria, Australia. May 2018.

Doug Gimesy / Rear left ankle of a male Platypus (Ornithorhynchus anatinus) showing venomous spur and ticks (Ixodes ornithothynchi). Dartmouth, Victoria, Australia. May 2018.

Doug Gimesy / Rear left ankle of a male Platypus (Ornithorhynchus anatinus) showing venomous spur. Healsville, Victoria, Australia. Collected about 15 minutes earlier as part of formal population monitoring researc...

Neil Aldridge / Tracking bracelet around the ankle of Thandi the female Southern white rhinoceros (Ceratotherium simum) who lost her horn in an attack by poachers, Kariega Game Reserve, Eastern Cape Province, Sout...

Neil Aldridge / Tracking bracelet around the ankle of Thandi the female Southern white rhinoceros (Ceratotherium simum) who lost her horn in an attack by poachers, Kariega Game Reserve, Eastern Cape Province, Sout...

Nick Upton / Stable fly (Stomoxys calcitrans) piercing skin to suck blood from photographer's ankle, Samos, Greece, August.

Sharon Heald / Himba woman's ankle bracelets, Kaokoland, Namibia

Pete Oxford / Zulu ankle rattles made from larvae of Green lunar moth, Natal, South Africa

Pete Oxford / Zulu ankle rattles made from larvae of Green lunar moth Natal South Africa

Tony Heald / Masai ankle decoration close up. Amboseli National Park, Kenya. July.