marked concentration of sightings between May and September. It is unknown if this has any significance. With scant data at hand, it still appears the best odds of encountering small beaked whales of this species is during the summer months in the area between Santa Catalina and San Clemente Islands and the mainland. The causes of death of two Perrin's beaked whales can be tentatively inferred. The specimen found in 1997, was starving at the time of death, possibly following a parasite infection (Dalebout et al. 2002). The female found in 1975 had died around May 14 (Mead 1981), and its juvenile was found on May 22. Since the calf was not fully weaned, its death is likely a direct consequence of the loss of its mother. See also List of cetaceans CMS Whale & Dolphin Conservation Society (WDCS) https://www.whalefacts.org/perrins-beaked-whale-facts/ https://marinebio.org/species/perrins-beaked-whales/mesoplodon-perrini/ https://animaldiversity.org/accounts/Mesoplodon_perrini/ References (1990): Whales and dolphins of New Zealand and Australia: An identification guide. Victoria University Press, Wellington. (1995): Whales, dolphins and porpoises. HarperCollins, London. (1989): Beaked whales of the genus Mesoplodon. In: : Handbook of marine mammals Vol.4: 349-430. Academic Press, London. (1994): Dolphins, porpoises and whales: 1994-98 Action plan for the conservation of cetaceans. IUCN, Gland, Switzerland. (1978): Beaked whales. In: : Marine mammals of the eastern North Pacific and Arctic waters: 88-95. Pacific Search Press, Seattle. Footnotes Mesoplodont whales Mammals described in 2002