Recent evidence suggests, however, that Killer Whales (orcas) may prey upon younger humpbacks before they reach maturity. To prevent extinction, IWC banned commercial humpback whaling in 1966. Students brainstorm what features a marine mammal needs to survive in a marine environment. These populations are distinct. Participants watch from shore or on touring boats.  Parts of wintering grounds around the globe have been poorly studied or being undetected, such as around Pitcairn Islands, Northern Mariana Islands (e.g. , Visible scars indicate that killer whales (orcas) can prey upon juvenile humpbacks, though until recently hunting had never been witnessed and attacks were assumed to be superficial in nature. This ring can begin near 30 m (98 ft) in diameter and involve the cooperation of a dozen animals. (2), Lesson 2 - Patterns in the Hawaiian Islands (3), Lesson 3 - How Did the Island Chain Form?  Within the Arabian Sea, Masirah Island and Gulf of Masirah, Halaniyat Islands and Kuria Muria Bay are hot spots for the species.  Humpback whales have been known to hybridize with other rorquals; there is a well-documented report of a humpback-blue whale hybrid in the South Pacific.  Interaction with gray, fin, and right whales have been observed.  Humpbacks have been considered rather vagrant into Persian Gulf, however new studies indicate more regular presences can be expected. Breiwick JM, Mitchell E, Reeves RR (1983) Simulated population trajectories for northwest Atlantic humpback whales 1865–1980. Figure 2. , In Japan, humpback, minkes, sperm and many other smaller Odontoceti, including critically endangered species such as North Pacific right, western gray and northern fin, have been targets of illegal captures. For life in the Northern Hemisphere, July and August in the South Atlantic (.. 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