Bence Mate / Great egret (Ardea alba) with green colouring near beak during breeding season, Lake Csaj, Pusztaszer, Hungary, April.

Paul D Stewart / Lithograph with contemporary colouring, continental version of the wallchart produced by Benjamin Waterhouse Hawkins for the Department of Science and Art 1862. It is entitled 'Enaliosauria, or marine...

Paul D Stewart / Lithograph with contemporary colouring, continental version of the last wallchart produced by Benjamin Waterhouse Hawkins for the Department of Science and Art 1862. It is entitled 'Pachydermata and C...

Paul D Stewart / Illustration of 'The Entomologist'. Rare copper print with original hand colouring, drawn by George Spratt, printed by George Madely, and sold individually as part of a series through Charles Tilt's F...

Paul D Stewart / Copperplate engraving of rays with contemporary hand colouring from 'Bilderbuch fur Kinder' by F.J. Bertuch, Weimar, 1795. This book set out to explain and illustrate a range of topics for children.

Paul D Stewart / Copperplate engraving of a Stag Beetle (Lucanus cervus), with hand colouring possibly by Donovan himself. While most plates were thinly coloured to tint the interstices of the lines of the engraving b...

Paul D Stewart / A rare British broadsheet illustration with contemporary hand colouring, drawn and engraved by John Emslie and published by James Reynolds in 1849. It shows reconstructions of extinct creatures in the...

Edwin Giesbers / Portrait of Eurasian Jay (Garrulus glandarius) showing colouring on cheek and primary flight feathers. The Netherlands, June.

Igor Shpilenok / Looking down into the crater lake of the Maly Semyachik Volcano with ice at the rim and azure blue colouring caused by the acidic water, July.

Karine Aigner / Children learning about Mexican Free-tailed bats (Tadarida brasiliensis), and make 'bat masks' while waiting for the bats to emerge at Bracken Cave. Bracken Cave Preserve, San Antonio, Texas, USA. Jul...

Ashley Cooper / The Aiguillette des Posettes with Bilberry plants colouring up in late summer, above Chamonix, French Alps, and the rapidly retreating Glacier du tour. France, September 2014.

Ashley Cooper / The Aiguillette des Posettes with Bilberry plants colouring up in late summer, above Chamonix, French Alps, and the rapidly retreating Glacier du tour. September 2014.