Chris Shields / Illustration of Harlequin ladybird (Harmonia axyridis), four colour variants.

Jane Burton / Bronze armoured catfish {Corydoras aeneus} albino and normal colour variants, captive, from South America

Jane Burton / Swordtail {Xiphophorus helleri} male Tuxedo lyre-tail displaying to female Red lyre-tail in foreground, captive, from Central America

Jane Burton / Bronze armoured catfish {Corydoras aeneus} albino and normal colour variants, captive, from South America

Jane Burton / Swordtail {Xiphophorus helleri} male Tuxedo lyre-tail (below) and female Red lyre-tail (above), captive, from Central America

Nigel Cattlin / A mating pair of Harlequin ladybirds (Harmonia axyridis) on apple leaves damaged by leaf-curling aphids (Dysaphis sp.). Two colour variations. Berkshire, June