Fish don’t exist. In her novel “Why Fish Don’t Exist,” Lulu Miller points out that a true “fish” clade containing an ancestor ...

While the common ancestor of vertebrates with synovial joints is still a mystery, the oldest specimen with evidence of these ...

In the depths of the ocean, where there’s no sunlight and the pressure could crush a submarine, a handful of animals have ...

Researchers found evidence that the joints evolved as the species became active predators with jaws and mobile skeletons.

“This is the most comprehensive scientific publication on the distribution of fish bioluminescence ever written, and the authors show that bioluminescence evolved way more times independently than ...

Deep-sea fish adapt to some of the most extreme conditions on Earth. New research analyzing their evolution finds the same ...

For years, scientists felt like the fish they were watching watched them back. A new study suggests they can recognize a diver's outfit.

Wrasse fish use hard surfaces as tools to crack open prey. This behavior shows flexible thinking and environmental awareness.

Tiktaalik roseae had fish-like fins, a flattened skull (similar to a crocodile), and is thought to have lived in shallow water, using its fins to prop itself up ...