Guppies can be fooled by optical illusions into believing objects are smaller or larger than they really are. This suggests they might not always make the best choices in their natural environment.

For female guppies, there’s more to life than making babies. A new study finds that guppies experience menopause just like humans and other animals. The study is the first demonstration of menopause ...

How people respond to stressful situations can say a lot about their personalities—and it turns out the same is true of a little fish called the Trinidadian guppy. That's according to a study ...

Baby guppies grow quickly when they receive proper nutrition and clean water conditions. As the fry began getting larger, their original tank started becoming overcrowded. To keep them healthy, I ...

Canadian evolutionary scientists say claws are used by the male guppy fish to treble the amount of sperm transferred to reluctant females Added the species has evolved to benefit males at the expense ...

It’s not uncommon in the animal world for males to harass females and force them to mate with them, even if the females are not interested. But a new study has revealed female guppy fish learn to ...

Larvae-eating guppy fish can help combat the spread of dengue, a mosquito-borne illness giving rise to hundreds of thousands of severe cases including 20,000 deaths worldwide every year. Larvae-eating ...

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 ...

When Robert Heathcote dips his head into the rivers of Trinidad, he’ll often see little black dots moving through the water, even when it’s murky. Those dots are the eyes of small, inch-long fish ...

When a guppy jumped out of a laboratory tank and nearly landed in her cup of tea, Daphne Soares couldn’t resist putting her current research on hold to investigate this strange leaping behavior. "The ...