Rear view of a male Humpback whale (Megaptera novaeangliae australis) engaged in a dominance display by blowing a stream of air bubbles. Visible in the top left background is a female humpback whale. This female was associated with the male blowing bubbles. The pair were approached by several other males, which precipitated the bubble blowing seen here. Displays like this are a common behavior among male humpback whales accompanying females during the breeding season. Vava'u, Tonga, South Pacific.