Bernard Castelein / Rainbow lizard (Agama agama), Gambia.

Jiri Lochman / Common scaly foot legless lizard (Pygopus lepidopodus), Cape Range National Park, Ningaloo Coast UNESCO Natural World Heritage Site, Western Australia.

Markus Varesvuo / Capercaillie (Tetrao urogallus) close up of foot, Kuusamo, Finland, March.

Brent Stephenson / Common skink (Oligosoma polychroma) close up of the hind leg and foot, Tikokino, Hawkes Bay, New Zealand, September.

Bryan and Cherry Alexander / Emperor penguin (Aptenodytes forsteri) feet showing strong and scaly with powerful claws. Snow Hill Island. Antarctic Peninsula.

David Shale / Deepsea Scaly foot gastropod (Crysomallon squamiferum ) with commensal polychaete on foot, from Dragon vent field, Indian Ocean, November 2011

David Shale / Deepsea Scaly foot gastropod (Crysomallon squamiferum) with commensal polychaete on foot, from Dragon vent field, Indian Ocean, November 2011

David Shale / Detail of deepsea Scaly foot gastropod (Crysomallon squamiferum ) from Dragon vent field, Indian Ocean, November 2011

David Shale / Deepsea Scaly foot gastropod (Crysomallon squamiferum ) from Dragon vent field, Indian Ocean, November 2011

David Shale / Deepsea Scaly foot gastropod (Crysomallon squamiferum ) with commensal polychaete on foot, from Dragon vent field, Indian Ocean, November 2011

Robert Valentic / Brigalow scaly foot legless lizard {Paradelma orientalis} mimics the threat display of a venomous Brown snake to deter predator, Yelarbon, Queensland, Australia, Endangered

Robert Valentic / Common scaly foot legless lizard {Pygopus lepidopodus} hunting for prey in Banksia tree, Kalbarri, Western Australia

Robert Valentic / Western hooded scaly foot legless lizard {Pygopus nigriceps} prior to shedding its skin, South Australia

Michael & Patricia Fogden / Hooded Scaly Foot (Pygopus nigriceps) a legless lizard, grooming itself with tongue, King's Canyon, Watarrka National Park Northern Territory, Australia

Michael & Patricia Fogden / Hooded Scaly Foot (Pygopus nigriceps) a legless lizard, on ground, under log, King's Canyon, Watarrka National Park, Northern Territory, Australia

Robert Valentic / Hooded scaly foot (legless lizard) male {Pygopus nigriceps} Western Australia

Robert Valentic / Hooded scaly foot (legless lizard) {Pygopus nigriceps} mimics Brown snake. NT Australia

Daniel Nunez / Guatemalan beaded lizard (Heloderma charlesbogerti) foot detail, Heloderma Natural Reserve, Zacapa, Guatemala. Endangered.

Nick Garbutt / Komodo dragon (Varanus komodoensis) male, front leg and foot detail, Komodo Island, Komodo National Park, Indonesia. Endangered.

Tui De Roy / Alcedo giant tortoise (Chelonoidis vandenburghi) resting, head on foot, during dry season, Alcedo Volcano, Isabela Island, Galapagos, Ecuador.

Tui De Roy / Detail of hind toes of Alcedo giant tortoise (Chelonoidis vandenburghi), Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador.

Roland Seitre / Close up of Southern cassowary (Casuarius casuarius) feet, Australia. IUCN: Vulnerable. Captive.

Roland Seitre / Close up of Double-wattled cassowary (Casuarius casuarius) feet, Kuranda, Queensland,Australia. IUCN: Vulnerable.

Bruce Thomson / Brigalow scaly-foot lizard (Paradelma orientalis) basking on rocky hillside, Dalby, Queensland, Australia.

Doug Gimesy / Portrait of a Common scaly-foot (Pygopus lepidopodus). Captive at Lilydale High School, Lilydale, Victoria, Australia. Property released.