Use logical order in your paragraphs. Group similar details and connect them with transitions.

     All animals are part of an animal group. Frogs start as tadpoles in the water, and then they grow legs to live on land. A mammal drinks milk from its' mother. Owls and chickens are birds. All birds have feathers, but not all birds can fly. A bat is a mammal. Amphibians begin their life in the water, but they mostly live the rest of it on land. Dogs, whales, and humans are mammals. One group is birds. Bats are the only mammals that can fly! One group is amphibians.

     All animals are part of an animal group. One group is mammals.  A mammal drinks milk from it's mother. Dogs, whales, and humans are mammals. A bat is also a mammal. In fact, bats are the only mammals that can fly! Another group is birds. All birds have feathers, but not all birds can fly. Owls and chickens are birds. Amphibians are another group. They begin their lives as tadpoles in the water, in the water, but they mostly live the rest of it on land. For example, frogs start as tadpoles in the water, and then they grow legs to live on land.