Sue's Tanks And Fish

Endlers are closely related to guppies. They can breed with them - most of the endlers in shops are really endler-guppy hybrids, mine are. You have to go to a specialist breeder to get pure endlers.
They are livebearers but the females are bigger and plain grey so not many shops sell them as they aren't pretty. The males are smaller than male guppies. Their bodies are shorter and they also have shorter tails, but they do come in bright colours with a fair amount of metallic sheen which doesn't photograph properly.
On the whole endlers, even the endler guppy hybrids, are healthier than pure guppies.
My group of males constantly chase each other. First they'll chase one, then the group will change direction and chase a different one. They never keep still so they are very hard to get good pics of.

MA (at least the one near me) usually has some in. If yours does, look at the fish carefully and you'll probably see there are 2 or 3 different patterns in the tank.