Quote[/b] ]Genealogy - The Endler's Livebearer is very close to the guppy, poecilia reticulata, and can produce offspring with the common guppy. However, these offspring are not fertile, and therefore, by definition, the Endler's is NOT of the same species as the guppy, as many believe. The Endler's probably evolved divergently from the Guppy species, but must have become isolated at some point, and through divergent evolution became too genetically different from the guppy for interbreeding. It could also have been a spontaneous mutation in one guppy's reproductive stem cells, which was parent to all of the fry in one drop. This drop would create a new line far enough from the guppy to be a new species. Endler's have not been assigned a species name, and are therefore called "poecilia sp." Either way; the Endler's is nearly identical to the guppy with regards to care. Overall, I think the Endler's livebearer is a great fish, worth a dedicated species tank. A stable breeding colony is easily created from only 3 pairs, they will fill any tank given time, as well as replacing all of their losses. They are absolutely enthralling to watch and have gorgeous coloration. If you can get a hold of these I would definitely invest, and Clint has some available. I got mine from him and they arrived (and stayed) in great condition. They are of the peacock variety, which is, in my opinion, the best looking of the endlers. See his Stock Shop to order, and his article for info on them. Nick also has some fry available in his Stock Shop.