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A rare sighting of five killer whales (Orcinus orca), including one juvenile, occurred on 20 March 2000 during an aerial survey of waters west of the Hawaiian island of Ni'ihau. The sighting occurred ca. 11 km west of Kamalino Bay on Ni'ihau, at 21 049' N, 160020' W. Killer whales are not un known in Hawaiian waters, but the most recent confirmed sighting on record for Hawaiian waters was in 1979. ON 20 MARCH 2000 during an aerial survey of marine mammals in Hawaiian waters, four large delphinids and one juvenile were sighted approximately 11 km west of Kama lino Bay on Ni'ihau (21 049' N, 160020' W) in waters approximately 1830 m (1000 fath oms) deep. The animals were circled for 7 min at an altitude of 244 m, during which time two photographs (Figure 1) were ob tained through a belly window using a Pentax 645 camera with a 206-mm lens. Simulta neously, altitude measurements were obtained with a radar altimeter (Collins 50A). Positive identification of species at the time of sight ing was hampered by glare. One observer (M.W.N.) commented that the animals ap peared "unusually robust." In the absence of positive identification, the sighting was re corded as "unidentified delphinids." Subsequent inspection of the photographs revealed clear diagnostic features of killer whales (Orcinus orca), including evidence of white eye patches on three individuals, white anus patch on two individuals, a relatively tall dorsal fin on one individual, and light gray saddle marking behind the dorsal fin of one

Killer Whales (Orcinus orca) Sighted West of Ni'ihau, Hawai'i