In theory, a reaction to an out-of-place mark in a reflection is assumed to be evidence of self-recognition for other animals as well. Chimpanzees, elephants, and dolphins are just some that have ...

A shrimp scrap drifted down the face of a mirror, and a small reef fish tracked it like it was watching a slow-motion ...

Fish that live in rivers, ditches, and streams are better able to withstand warming water than fish in the sea. This is the ...

For many animals, siblings are a key component of their social environment during early life. Previous research has shown ...

Women who eat small fish whole -- from the head to the bones -- may face a lower risk of dying from cancer and other causes, a new study out of Japan finds. Capelin fish is pictured here. Getty Images ...

A UC San Diego study published Tuesday found that more than 90% of freshwater game fish in Southern California had parasites capable of infecting humans and causing health problems. The parasites are ...

Reef fish in different oceans often develop similar color patterns because evolution explores the same set of biological possibilities.

Researchers working across Island Nations in the South Pacific discovered that the plastics turning up in these fish were ...

Although pesticides can rid your home of cockroaches or farm fields of unwanted insects, they also can harm fish and potentially even people, according to a new study from Oregon State University. At ...

BOISE, Idaho — The City of Boise is working to understand if fish in the Boise River are being impacted by people. When water leaves the wastewater treatment facility and re-enters the river, the ...