A practically indestructible fish that can survive droughts, freezing, and crowding by the thousands into evaporating puddles where they are fed upon by herons, egrets, etc. Still, they are one of the most abundant creatures in the marsh. Sailfin mollies readily give birth to live young, and several generations can be easily raised in the aquarium. Males have large beautiful fins during the breeding season. Size: 2-5 cm.