Swordtails are available in some really eye ... The Endler’s livebearer (Poecilia wingei) is the smallest species on our list and a great fish for small aquariums. Males grow to just one inch ...

This Graphium policenes is one of nearly 40 species of swordtail butterflies known to inhabit Africa. Photograph by Rebecca Hale, NGM staff Farmer Philippe Andé finds solace in the creatures.