The 6 Groups of Animals 1. Mammals- Mammals are in the group of vertebrate animals, and they are warm-blooded, they are the only group of animals which gives birth to the young ones and they have fur or hairs on their body and only animals that have mammary glands for producing milk for their young ones. They have lungs to breathe. There are also many kinds of mammals like Kangaroos that have a pouch on their stomach to carry their babies and bat is the only mammal that can fly and platypus that lay eggs and so on. 2. Birds- They are warm-blooded animals. They are a group of animals that can fly, they have wings for flying in the air. They can fly because they are very light in weight. They have a beak for eating. They have a claw for holding the branches of the tree and for standing. They have a four-chambered heart. They have lungs to breathe. They lay eggs and are in the group of vertebrate animals. 3. Fish- They are in the group of vertebrate animals. They are only animals that br
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