Imagine tracing your family tree not just to distant ancestors, but to creatures that once swam in primordial seas and hopped along muddy riverbanks. The connection is more than poetic—it’s written in ...

Picture this: you’re gazing into a vibrant aquarium, entranced by the hypnotic dance of fish. But what if I told you that ...

We share a common ancestor with all life on Earth, but we share common ancestors with some lineages of the Tree of Life much more recently than the 400-million-year-old fish that first came onto land.

Thanks to a new anglerfish family tree, now we know. Scientists built this evolutionary tree using genetic information from hundreds of samples and anglerfish specimens across the globe.

Evolutionary biologist Dolph Schluter is pictured at one of his ponds containing stickleback fish at the University of British Columbia. Katie Chu Sign up for CNN’s Wonder Theory science newsletter.

Eastern Baltic cod grow to much smaller sizes than they did just 30 years ago, because overfishing altered their genes, ...

Around 375 million years ago, a giant fish evolved limbs for walking. But some of its descendants reversed course on the evolutionary road, becoming swimmers again.

A trade-off between tooth size and jaw mobility has restricted fish evolution, Nick Peoples at the University of California Davis, US, and colleagues report June 24 th in the open-access journal ...

In her novel “Why Fish Don’t Exist,” Lulu Miller points out that a true “fish” clade containing an ancestor and all its descendants is an unrealizable dream, awkwardly grouping organisms with ...

Evolutionary biologist Dolph Schluter is pictured at one of his ponds containing stickleback fish at the University of British Columbia. Katie Chu Sign up for CNN’s Wonder Theory science newsletter.