Common Molly

Found in schools, over freshwater canals, ditches, ponds, rivers and warm springs as well as brackish coastal waters. They can vary in colour and pattern.
Widespread Central America, South America

A freshwater fish one of the most popular in the aquarium trade as they are easy to keep in various temperatures of water, are prolific live bearers as well as being very varied with their colourful and patterned tails.
They have also been introduced into various countries as a means of mosquito control.