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.

The more colorful males were up to two times more sexually active than other guppies. By Laura Baisas Published Jul 10, 2025 3:00 PM EDT Get the Popular Science daily newsletter💡 Breakthroughs, ...

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 ...

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TALLAHASSEE, Fla.--In the natural stream communities of Trinidad, guppy populations live close together, but evolve differently. Upstream, fewer predators mean more guppies but less food for each; ...

Guppies faced a see-through food trap, and their reactions ranged from patient detours to head-long collisions, exposing big individual gaps in self-control. Compared with a cousin population, these ...

Guppies, a perennial pet store favorite, have helped a UC Riverside scientist unlock a key question about evolution: Do animals evolve in response to the risk of being eaten, or to the environment ...

Guppies to Groupers, tropical and marine fish in the home aquarium. Guppies to Groupers was a program that was produced in the WQLN studios in the mid-1970s. It was hosted by local aquatic expert Paul ...

In this wild fishing challenge, we test whether live baby guppies and minnows can actually bring in the big catch. It’s a mix ...