The main predators of harp seals are Ursus maritimus, Orcinus orca, Somniosus microcephalus, and Odobenus rosmarus. Humans also kill harp seals for food, fur, and oil. ("Harp Seals", 2004; Kovacs, 1995; MarineBio.org, 2009; Schliemann, 1990)
Though harp seals tend not to be very vocal on land, females may make a shrill call if a predator comes near her pup. ("Harp Seals", 2004)
- Kovacs, K. 1995. Harp and hooded seals - a case study in the determinants of mating systems in pinnipeds. International Symposium on the Biology of Marine Mammals in the North East Atlantic, Developments in Marine Biology 4: 329-335.