 A spread of new foraging behaviors also occurred in an Argentinian population of kelp gulls ("Larus dominicanus").During the 20th century, individuals in this population began to non-fatally wound the backs of swimming whales with their beaks, feeding on the blubber and creating deeper lesions in areas that were already wounded.Aerial photographs showed that gull-induced lesions on local whales increased in frequency from 2% to 99% from 1974 to 2011, and that this behavior was not observed in any other kelp gull populations other than two isolated incidents.