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Humpbacks – Tonga tropical waters are the mating and calving grounds for endangered humpback whales who migrate to these warm waters annually from Antarctica.
Humpback whales (Megaptera novaeangliae) are baleen whales that average 19 meters (62 feet) long as adults. They have fleshy knobs on the ridges near the head, and their flippers are one third of their body length. As active swimmers, breaching, rolling, tail lobbing, and spyhopping are common behaviours. Humpbacks are very vocal in socialising, and the males sing long, distinctive songs while at their wintering grounds, most likely done to attract the females. They feed almost exclusively on krill (small crustaceans), small pelagic fish and crabs. When surfacing, dual blowholes produce a tall, bushy spray.