The colors of different populations vary greatly depending on the number of predators. The fewer predators, the more colorful the guppy is. The more predators, the less colorful the guppy is. This feature is an adaptation of the guppy that occurred after the Fall.
CLASS: Actinopterygii (ray-finned fishes)
ORDER: Cyprinodontiformes (killifishes)
FAMILY: Poeciliidae (livebearers and topminnows)
GENUS/SPECIES: Poecilia reticulata
Size: Up to 1.5 in (4 cm); females are larger than males
Diet: Algae, mosquito larvae, crustaceans, insects
Habitat: Waters of Barbados, Trinidad, Central and South America