Guppies with big brains outlive others by outmaneuvering their predators—but this only works in female guppies, not males. The rest of this article is behind a paywall. Please sign in or subscribe to ...

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 ...

From our perspective, guppies lead simple lives—eating, reproducing, and, after a couple of years, dying. Apply a little evolutionary pressure, though, and they can evolve larger brains that make them ...

In a Swedish lab, Alexander Kotrschal has deliberately moulded the intelligence of small fish called guppies. From a starting population, he picked individuals with either unusually large or small ...

Animals with large brains are considered to be more intelligent and more successful than those with smaller brains. Researchers have now provided the first experimental evidence that large brains ...

The streams of Trinidad and Tobago are home to the most unexpected of landscape gardeners. They’re guppies – tiny and beautifully coloured fish, just an inch or so long. Without tools or plans, they ...

There are no potential conflicts between the author of this article and any parties related to the research being reported or the journal in which the study was published. All organisms have been ...

Bringing a fish home for your child might sound like a small decision, but it’s actually a big step into responsibility, bonding, and joy. Among the most popular pet fish, goldfish and guppies top the ...