Eubalaena australis, Balaenidae, Southern right whale, marine mammals, cetaceans, mysticetes, baleen whales, Larus dominicanus, Laridae, kelp gull, juvenile, birds, seabirds, behavior, interspecific relationships, symbiosis, parasitism, parasite, Valdes Peninsula, Patagonia, Argentina, Atlantic Ocean.

Remarks: This kelp gull juvenile feeds on pieces of dead tissue and parasites attached to the skin of a Southern right whale. To all appearances this relationship may be beneficial for both species (mutualism). However, gulls often produce deep and painful wounds on the skin of whales. For this reason, the kelp gull is considered a parasite for the Southern right whale.