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A bird is an endothermic vertebrate that has feathers and a four-chambered heart. A bird also lays eggs. All mammals are endothermic vertebrates that have a four-chambered heart and skin covered with fur or hair. Most mammals are born alive, and every young mammal is fed with milk produced by organs in its mother's body. These organs are called mammary glands. The word mammal, in fact, comes from the term mammary.

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What mammals have bird like characteristics?

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