Eubalaena australis, Balaenidae, Southern right whale, marine mammals, cetaceans, mysticetes, baleen whales, Cyamus sp., Cyamidae (cyamids), whale lice, marine invertebrates, crustaceans, amphipods, callosities, behavior, interspecific relationships, symbiosis, parasitism, parasite, Valdes Peninsula, Patagonia, Argentina, Atlantic Ocean.

Remarks: The right whales have callosities (rough tissue) on the head. The callosities take on a pale colour due to the presence of parasitic amphipods known as whale lice.