Anup Shah / Hamadryas baboons display red bottoms {Papio hamadryas} C

Anup Shah / Rear view of two Common zebra grazing {Equus quagga} Masai Mara GR, Kenya East Africa

Chris Mattison / Endemic Stone plant (Argyroderma delaetii) also known as Bababoudjes (Babies' bottoms), growing among quartz pebbles in the Knersvlakte, Western Cape, South Africa

Chris Mattison / Endemic Stone plant (Argyroderma delaetii), also known as Bababoudjes (Babies' bottoms), growing among quartz pebbles in the Knersvlakte, Western Cape, South Africa

Mike Read / Melancholy thistle (Cirsium helenioides) in wildflower meadow, Askrigg Bottoms, near Askrigg, Yorkshire Dales National Park Yorkshire, England, UK, July.

Mike Read / Farmer cutting the hay, Askrigg Bottoms Meadow, Askrigg, Wensleydale, Yorkshire Dales National Park, Yorkshire, England, UK July.

Francois Savigny / Indian sambar (Cervus unicolor) female, Ranthambore NP, Rajasthan, India

Roland Seitre / Crab-eating macaque (Macaca fascicularis) leaping from rocks into the sea, Thailand

Laurent Geslin / Hippopotamus {Hippopotamus amphibius} marking its territory, Khwai river, Okavango Delta, Moremi reserve, Botswana

Staffan Widstrand / Black Guillemot or Tystie (Cepphus grylle) rear view of bird diving below surface, Svalbard, Norway, July

Anup Shah / Celebes / Black crested macaque (Macaca nigra) group grooming, showing female bottoms, one on right in estrus the other not,Tangkoko National Park, Sulawesi, Indonesia.

Denis-Huot / African Elephant (Loxodonta africana) male flanks and tail. Masai-Mara Game Reserve, Kenya.