In Dolphin's Triumph, a baby dolphin learns that determination pays o ff. She practices swimming fast until she can leap from the water and fl y through the air in an arch. Bottlenose dolphins are marine mamm als. They live in the sea, breathe air, and have warm blood. Baby marine mammals (called calves) drink their mother's milk. Dolphins enjoy swimm ing fast, surfing the waves, and leaping out of the water. About the Author: Rebecca Johnson is an award-winning pri mary school science teacher and has written more than 60 books for child ren.