Guppies are a common aquarium breed, but also an invasive species on many continents. Learn how to care for guppies and the damage they can do in the wild.

The way guppy fish behave suggests they can be tricked into believing holes are larger or smaller than they really are – but they don’t always interpret the optical illusions in the same way ...

A properly dressed male guppy, with its gaudy blue spots and brilliant splashes of orange, can't help but stand out. But for a fish that spends its life swimming among predators, it seems that ...

Male guppies that glow with more orange aren’t just fashion-forward — they’re also significantly more sexually active. A UBC study reveals that brighter coloration is linked to virility and is ...

They then photographed live fish with black and silver eyes, recalibrated the images for guppy vision, and printed them onto sheets of clingfilm.

Guppy's real name is John Douglas Troup. He adopted the fish moniker as an 11-year-old bowling on a youth team in South Carolina called the Guppies.

Tiny guppy fish change their eye colour to warn off rivals, new research shows. When facing an opponent, Trinidadian guppies rapidly turn their irises from silver to black before attacking their ...

Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent every weekday. For guppies (Poecilia reticulata) getting ready to mate, the color orange speaks volumes.

The guppy studied is the tiny fish in the bottom-left corner. Also shown are the two predators researchers used to stress the guppy out: a heron and a blue acara cichlid. The guppy studied is the ...

Tiny guppy fish change their eye colour to warn off rivals, new research shows. When facing an opponent, Trinidadian guppies rapidly turn their irises from silver to black before attacking their ...