Tony Wu / Parasitic copepod in the Caligidae family (possibly Caligus sp. or Lepeoptheirus sp.),that was associated with a Ocean sunfish (Mola mola) ocean sunfish. The long appendage visible at the rear end is...

Eric Baccega / African wild dog (Lycaon pictus) scooting / rubbing its rear end. Moremi National Park, Okavango delta, Botswana, Southern Africa

Cyril Ruoso / Common eider (Somateria mollissima) female ducking under sea surface, down is collected from wild ducks on Lanan Island, Vega Archipelago, Norway June

Anup Shah / Common / Plains Zebra (Equus quagga burchellii) rear view of two, Maasai Mara National Reserve, Kenya.

Juan Carlos Munoz / Giraffe (Giraffa camelopardalis) close up of hind quarters, Namibia

Pete Oxford / Indian Rhinoceros (Rhinoceros unicornis) rear view, Kaziranga National Park, Assam, North East India.

Pal Hermansen / Great spotted woodpecker (Dendrocopos major) half hidden in nesting hole, most likely feeding chicks, Hedmark, Norway June

Mark Taylor / Tabby cat Picasso, 4 months, Showing his rear end and looking round.

Juan Carlos Munoz / Grevy's zebra female (Equus grevyi) close up of tail swinging, Captive, occurs in Kenya and Ethiopia, Endangered species.

Roland Seitre / Pygmy hippopotamus (Hexaprotodon liberiensis) close up of tail, captive, occurs in West Africa.

Paul Hobson / Red fox (Vulpes vulpes) in snow, jumping, Yellowstone, Wyoming, USA, February.

Cyril Ruoso / Close up of Sumatran rhinoceros (Dicerorhinus sumatrensis) rear view of female, part of a breeding program, Way Kambas National Park, Sumatra, Indonesia.