See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. How people respond to stressful situations can say a lot about their ...

A new study has shown that some fish have more complex personalities than was previously thought. Scientists at the University of Exeter studying the behavior of Trinidadian guppies discovered that ...

In the first simulation, you've stocked your pool with about one hundred guppies, all of which are very drab in coloration at the beginning of the test. In the same pool you've placed about 30 rivulus ...

Scientists have discovered that female guppies choose males with uncommon color patterns to drive the evolution of their ...

Get unlimited access to ad-free articles and exclusive content. LiveScience When a guppy jumped out of a laboratory tank and nearly landed in her cup of tea, Daphne Soares couldn’t resist putting her ...

Spanish biologist Ignacio Paulin became fascinated by the behavior of these fish, in a project that could now disappear due ...

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 ...

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.

Young guppies who were able to see and interact with live fish developed larger brains than guppies who only saw other fish on a screen. This is shown in a new study from Stockholm University, ...

Male guppies pay a high cost for their sexual harassment of female guppies – including much higher mortality rates – a new study from Macquarie University has found. Sexual harassment in guppies, or ...