A study of Australian fish that care for offspring through mouthbrooding shows that things underwater are not always as monogamous as they seem. By Elizabeth Preston Lurking among the underwater ...

Raising babies in your mouth is no guarantee that they’re your own — as some Australian mouthbrooding fish can attest 1. Males belonging to some species of river-dwelling fish guard their young by ...

University of Maryland researcher Cheng-Yu Li was in the lab one day when he noticed a fish with a protruding jaw: a telltale sign that it was incubating eggs in its mouth, keeping its offspring safe ...