Nature's body surfers. (from Tideland Treasures, great book, by the way)
Bottlenoses cavort in ships' wakes and near shore waters. This social mammal travels in "pods" or herds of 4 to 6. Members tend or defend wounded, sick or young. They communicate underwater by high-frequency squeaks and whistles emitted through their blowholes. Dolphin navigate and locate food by making guttural clicks and responding to echoes made when the sounds rebound from objects. This built-in sonar is known as "echolocation".
I got the above footage from the beach in front of the camp I work at. The dolphins regularly swim in this bit of the water known as the "estuary". The island across the way is known as Botany Bay. On a side note, I went kayaking there today to collect some shells. The temperature was above 70 degrees Fahrenheit. Mmmm, I'm kind of digging this weather.