David Fleetham / Painted frogfish (Antennarius pictus) with first dorsal spine and lure extended to attract prey. Dumaguete, Philippines.

Peter Schwarz/ BIA / Common Wasp (Vespula vulgaris) head closeup, Hesse, Germany

Brent Stephenson / Salvin's albatross (Thalassarche salvini) flying at sea, closeup of head. Kaikoura, Canterbury, New Zealand, September. Vulnerable species.

MYN / Dirk Funhoff / Signal crayfish (Pacifastacus leniusculus) Idar-Oberstein, Hunsruck, Germany, January. Meetyourneighbours.net project

Jabruson / Low angle shot of a herd of Hippopotamuses (Hippopotamus amphibius) feeding in the Rutshuru River, before the slaughter of the hippos in the region during the overthrow of President Mobutu Sese Seko i...

Jabruson / Low angle shot of a herd of Hippopotamuses (Hippopotamus amphibius) in the Rutshuru River, before the slaughter of the hippos in the region during the overthrow of President Mobutu Sese Seko in the mi...

Juan Carlos Munoz / Iberian pig close-up of hind legs and tail, Sierra de Aracena Natural Park, Huelva, Andalucia, Spain, Europe. Breed used to produce Iberico ham / Jamon Iberico

Cheryl-Samantha Owen / Cape gannet (Morus capensis) covered in oil, during rehabilitation at the Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) South Africa, November 2011

Alex Mustard / A close up of the eye of a Tassled wobbegong shark (Eucrossorhinus dasypogon) illuminated with light from a snoot tube, Batanta Island, Raja Ampat, West Papua, Indonesia.

Alex Mustard / The skin of a Tassled wobbegong shark (Eucrossorhinus dasypogon), showing the rough placoid scales, commonly called denticles. These scales have the same structure as the shark's teeth and are as roug...

Alex Mustard / Portrait of a green iguana (Iguana iguana) amongst grass. Puerto Aventuras, Quintana Roo, Mexico.

Alex Mustard / Portrait of Male Sockeye salmon (Oncorhynchus nerka) showing teeth. Adams River, British Columbia, Canada, October.