Guppies aren't the only fish that can store their fries in the belly and able to give birth for months without any presence of male. Almost all fish that belong to the Poeciliidae family have the same reproductive system as guppies. Among the Poeciliidae fish, the most popular ones are endler, molly, platy, and swordtail. There are also other Poeciliidae fish that have recently become more popular as pets, but I try to focus on the popular 4. Endler Endler is one of guppy's closest relative. Infact, you can mate guppies with endlers to produce fertile offsprings. The majority of endler being sold today are actually not pure endler, but rather mixes of guppies. Most of the endlers that are sold retain their much of the wild appearance. Infact, their appearance almost resemble wild guppies. Compared to wild guppies, male endlers have distinctive sword-like coloration on the tail. The males are smaller than male guppies, so they can be smaller alternatives to guppies. It is said ...