Alex Hyde / Aposematism describes the use of bright colouration and bold patterns to advertise that an organism is unpalatable or dangerous. All three insects are foul-tasting or toxic if eaten: Wood Tiger moth...

Chris Gomersall / 2020VISION / Common nightingale (Luscinia megarhynchos) adult perched, singing, Cambridgeshire, UK, April. Photographer quote: 'Nightingales are more renowned for the beauty of their song than their looks. You are...

Terry Whittaker / 2020VISION / Grey Squirrel (Sciurus carolinensis) climbing over fence in parkland, Regent's Park, London, UK, April 2011. Photographer quote: 'Grey squirrels may be overfed, oversexed and over here, but they are s...

Jerry Monkman / Lone hiker at sunrise on the Bold Coast trail in Cutler, Maine, USA, June 2009. Model released

Jack Dykinga / Petrified sandstone formation with bold striated patterns and lichen covered stones, Paria Canyon-Vermilion Cllffs Wilderness, Arizona, USA

David Tipling / Curious North American racoon (Procyon lotor) coming right up to man in Central Park, New York City, USA May

Alex Hyde / Shieldbug / Italian Striped-Bug / Minstrel Bug (Graphosoma lineatum) showing bold black and orange warning colours (aposematism) that warn of its foul taste. Photographed on a white background. Aosta...

Fred Bavendam / Common Lionfish (Pterois volitans) has bold stripes to warn predators of its venomous spines, Milne Bay, Papua New Guinea

Paul D Stewart / First edition of Erasmus Darwin's 'Zoonomia', Part 1 'The Laws of Organic Life' with section revealing his remarkably prescient 'world without end' text on evolution. Erasmus Darwin was Charles Darwin...

Paul D Stewart / Portrait of Erasmus Darwin (1731-1802) from a picture by Wright of Derby, reproduced with later hand colouring by his grandson, Charles Darwin in 'Life of Erasmus Darwin' 1879 (Ernst Krause co-author)...