SUMMARYStaff at Lady Elliott Island Eco Resort off Australia’s southern Great Barrier Reef have observed a male bottlenose dolphin nicknamed Bubbles harassing bigeye trevally since at least 2017. The dolphin chases the fish until they vomit, then eats the regurgitated food. A new paper in Ecology and Evolution describes the behavior as kleptoparasitism and places it among food-stealing tactics seen in many other species.
Staff at the Lady Elliott Island Eco Resort off the southern Great Barrier Reef in Australia are well acquainted with the shenanigans of a male bottlenose dolphin they've nicknamed Bubbles. Bubbles has been around since at least 2017 and regularly harasses local bigeye trevally, chasing a fish around and stressing it so much that the fish throws up what it has consumed. Bubbles then devours the regurgitated food. The dolphin's unusual behavior is the focus of a new paper published in the journal Ecology and Evolution.
If you're thinking that Bubbles sounds like kind of a jerk and Flipper would never behave like this, think again. "This perception of dolphins as the ‘good guys of the sea’ has more to do with anthropomorphism—our tendency to assign human characteristics to them—and perhaps that’s because dolphins appear to be smiling," said co-author Asia Haines of the University of the Sunshine Coast. "Dolphins are predators and actively hunt their prey, whether it has been stolen from another species or not.”
The technical term is kleptoparasitism, and it usually involves one species taking food away from another, often via aggressive confrontation. Bees and wasps are common culprits, such as the cuckoo wasp, which lays its eggs in the nests of other wasp species. The behavior is often opportunistic across many species, including bears, coyotes, and wolves. Raptors, gulls, terns, and bald eagles have been known to attack other birds and take their food. Skuas and frigatebirds steal from other seabirds; masked shrikes steal food from wheatears; and Eurasian blackbirds have been seen stealing smashed snails from thrushes. Hyenas and jackals steal food all the time.