Hybrids
Endler's can be crossed with guppies, and the hybrid offspring are fertile. This is considered to dilute the gene pool and therefore is avoided by fish breeders who wish to maintain pure strains. Many fish sold in pet stores as Endler's livebearers are actually these hybrids. Some breeders are intentionally hybridizing Endler's with fancy guppies to create fish with the characteristics of both. In addition, as P. reticulata has been found in the same bodies of water as P. wingei, natural hybridization may also occur in the wild.
Read more about this topic: Poecilia Wingei