Turtles are really slow. When they are full-sized, they are very heavy. The salamander eats insects. In China and Japan, there are some 5 feet salamanders. A salamander weighs almost 50 pounds.
Salamanders help keep insect population down and they become food for larger animals.
Some ducks can dive 100 feet. Wood ducks eat wild rice. A duck's feathers have wax which keeps them dry and warm in the water. Ducks eat fish, water-lily acorns and insects. A duck's feet are webbed and they swim over 300 feet.