guppy

Guppies (Poecilia reticulata) are tiny freshwater fish native to South America and parts of Central America, though they are now found worldwide due to their popularity in the aquarium trade. They rarely grow longer than two inches, yet they pack a lot of personality into their small bodies. Male guppies are particularly famous for their elaborate, fan-like tails, which they display during courtship rituals in a shimmering array of blues, reds, yellows, and greens.

Biologically, guppies are "livebearers," meaning the females give birth to fully formed baby fish (called fry) instead of laying eggs. This makes them incredibly prolific breeders; a single female can produce dozens of offspring in just a few months. Because of their hardiness and simple needs, they are often recommended as the perfect "starter fish" for beginner aquarists learning the ropes of fishkeeping.

Outside fishkeeping, the word is usually understood in its literal sense: a small, colorful aquarium fish. Some people may use it playfully in comparisons about being small or outmatched, but that is not the main meaning of the word.

So, whether you see them in a home tank or read about them in a guide to aquarium fish, "guppy" brings to mind a tiny, lively freshwater fish full of color and movement.