Livebearers

As the name Livebearer suggests, this group is notable for giving birth to live young. This makes them extremely popular with children and new hobbyists as nothing stirs the budding aquarium keeper like livestock producing offspring, and with many of these species breeding is easy, frequent & prolific.
Livebearers commonly listed are Guppies, Mollies, Platys & Swordtails (although some other species are occasionally available). Within these species there are many varieties of colour & shape and where notable this is listed with the description.