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Much of the U.S. Navy's training activities in Hawai'i occur on the Pacific Missile Range Facility (PMRF), an area between the islands of Kaua'i and Ni'ihau. Surveys show that rough-toothed dolphins are the most frequently encountered and likely most abundant odontocete found on PMRF. Long-term photo-identification data indicate that individuals show considerable fidelity to Kaua'i and Ni'ihau, and genetic studies indicate they are demographically isolated from rough-toothed dolphins off Hawai'i Island.