Paul D Stewart / 1853 illustration of Gorilla, contemporary coloured copperplate engraving from 'Das Buch der Welt' John Weik, Stuttgart. The lowland Gorilla was first accurately described outside Africa by the missio...

Steve O. Taylor (GHF) / Carved Forest elephant (Loxodonta cyclotis) ivory tusks, for sale in shop on Nathan Road, Kowloon, Hong Kong, December 2012. This is identified as Forest elephant ivory by the pink tinge.

Paul Harcourt Davies / Green flower beetle (Psilothrix viridicoerulea) an irridescent flower beetle often with a bluish tinge on the thorax and head, Orvieto, Umbria, Italy, April

Paul Harcourt Davies / Green flower beetle (Psilothrix viridicoerulea) an irridescent flower beetle often with a bluish tinge on the thorax and head, Orvieto, Umbria, Italy, April

Nigel Cattlin / Cow parsley (Anthriscus sylvestris) stem node on wild umbellifer, Berkshire, England, UK. June

Nigel Cattlin / Alder (Alnus glutinosa) unopened purple tinged male catkins with smaller female catkins against a blue sky, Berkshire, UK, March.

Nigel Cattlin / Alder (Alnus glutinosa) unopened purple tinged male catkins with smaller unopened female catkins, Berkshire, UK, February.