Study reveals tool use in tropical fish species

Scientists have debunked the belief that using tools is unique to mammals and birds, after documenting tropical fish that smash shellfish against rocks to open and eat the meat, in a fascinating new study published in the journal Coral Reefs on 26 March 2025.

Dr. Juliette Tariel-Adam from the School of Natural Sciences at Macquarie University led a project tracking tool use in multiple species of wrasses—a colorful reef fish.

The study logs fish deliberately picking up hard-shelled prey like crabs and mollusks, smashing them against hard surfaces like rocks to access the meal inside.