He calls it the "Gup Thrust." It's somewhere between hilarious and obscene, something Elvis Presley might have tried if he could send 10 pins flying into the pit like Guppy Troup does. He's executed ...

Scientists have long suspected that big brains come with an evolutionary price — but now they've published the first experimental evidence to support that suspicion, based on their efforts to breed ...

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.

A long-term fish experiment reveals how a mechanism called density dependence, in which the population growth rate slows as the number of individuals rises, affects population dynamics on time scales ...

In this wild fishing challenge, we test whether live baby guppies and minnows can actually bring in the big catch. It’s a mix of strategy, surprise, and some unbelievable bites as we put this unusual ...