Tim Laman / Butterflies puddling, including Graphium sarpedon, Delias sp, and Graphium aristeus Vogelkop Peninsula, West Papua.

Dave Bevan / Platy (Xiphophorus maculatus) tuxedo colour variation, captive

Dave Bevan / Platy (Xiphophorus maculatus) red wagtail colour variation, captive

Dave Bevan / Platy (Xiphophorus maculatus) blue coral colour variation.

Dave Bevan / Green swordtail (Xiphophorus helleri) male, captive

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

Jane Burton / Green swordtail {Xiphophorus helleri} and Bronze catfish {Corydorus aeneus} coexist in some parts of their range, captive, from central america

Jane Burton / Red swordtail {Xiphophorus helleri} males sparring, swimming backwards at each other with bodies arched and tails displayed, females in the foreground, captive, from Central America

Jane Burton / Red platy fish {Xiphophorus maculatus} captive, from Central america

Jane Burton / Red swordtail {Xiphophorus helleri} male chasing female, captive, from Central America

Jane Burton / Green swordtail {Xiphophorus helleri} female with young fry sinking away below her to avoid being eaten, captive, from Central America, sequence 3/3

Jane Burton / Close up of gonopodium of male Red swordtail {Xiphophorus helleri} captive