September 28, 2015 — Rabbitfish help one another in a way that had been observed only in mammals and highly social birds, according to a new study.

Pairs of these tropical fish will cooperate: While one has its head down feeding in the crevices of coral reefs, the other holds its head at an upward angle, apparently watching for predators.

The fish take turns between feeding and keeping a lookout, said Simon Brandl, a behavioral ecologist at James Cook University in Australia and one of the study’s authors.

He added that “when one is down, in 90 percent of cases, the other has its head up.” He and his colleagues reported their findings in the journal Nature Scientific Reports.

Read the full story at The New York Times