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BiologyLittle is known about the behaviour of the Indo-Pacific humpback dolphin, but small groups of around three to seven individuals are most commonly seen (5). These are slow-swimming dolphins, typically travelling at around 4.8 kilometres per hour (5). Despite this sluggishness, many aerial displays are seen; including breaching, when the dolphin leaps out of the water, lob tailing (slapping the surface of the water with the tail) and spyhopping, when the dolphin raises its head vertically out of the water and then sinks below the surface quietly (6). These dolphins feed primarily on reef-associated and estuarine fish (9). Individuals may be aggressive and this appears to affect dominance rank within the group (5).