Also called Endler’s Livebearer, Endler’s Guppies are named after John Endler, the man who rediscovered the species in 1975. These fish are similar in appearance to regular Guppies and some debate exists whether the two species are, in fact, separate species at all because they are able to hybridize and produce fertile young. Endler’s Guppies vary in coloration and pattern, though many specimens exhibit intense black, orange and metallic green colors on their bodies and tails. Many specimens also have double sword tails. These fish are endemic to a limited area in northeastern Venezuela where they inhabit brackish lakes.