The dolphins are...
They have beak and two wings.
They have fur or hair.
The frogs are...
Their babies drink milk.
They have a moist skin.
They breathe with gills.
They live in water.
Most of them can fly.
They born from their mother's womb.
Some of them have no legs.
They have scales and a dry skin.
The penguins are...
The snakes are.
They have scales and fins.
The sharks are...
They breathe with gills when young, but late develop lungs.
They have two legs.
They have feathers.
