Humpback whales migrate from their feeding grounds in Antarctica to Tonga where they stay from July through September to court, mate and calve. So named for the bump in front of their small dorsal fin, humpbacks are among the most energetic and inquisitive of the baleen whales. For the lucky observers, the humpback may display spectacular behaviours, such as breaching, fin slapping and as captured in this picture, slide body slamming.