Humpback whales leave their winter feeding grounds in Antarctica and migrate in June to mate and raise their calves in the warmer waters around Tonga. There are lots of whales and their calves here at the present time. We went out with a local guide, and another couple from New Zealand, and saw a number of Humpback whales during the day. The highlight was a mother and it's calf that stayed put in one area for over an hour and a half while we snorkeled around them and watched their interaction. During that time the mother stayed down about 30 feet, rising twice to the surface to breathe. The calf was far more active – it would feed with the mother, come up to breathe, and swim over to check us out as we snorkeled on the surface. He was very curious, with his big eye right on us as he went by. Often he got so close we could almost have touched him. The guide estimated him to be about seven weeks old, and that he would typically gain about 100lb of body weight per day. The opportunity to observe the feeding, nuzzling, and audible communication between the mother and calf was a very special experience to us.