Guppies are native to Central and South America, and can live in a wide variety of freshwater habitats. Their tolerance for a high range of water qualities and salinity makes them a popular, hardy fish for the aquarium.
Guppies exhibit sexual dimorphism, with females having a rounder, drab body, although some varieties may have colourful fins. On the other hand, males are have slimmer bodies and are very colourful, with beautiful flowing fins.
Human selection has proliferated desirable traits such as bright colors and large fins. Many generations of selective breeding has resulted in guppies with countless different combinations of patterns and colours.