Birds are neither mammals (they don't have mammary glands) nor reptiles (they are not cold blooded), but instead belong in a grouping all their own. The bird group is one of six basic animal groups, with the others being... More » Pets & Animals Birds

Birds are not mammals. They don't have fur, and they don't nurse their young with milk as mammals do; however, birds share some traits with mammals. They are warm blooded and can eat a wide variety of food, from fruits a... More » Pets & Animals Birds

The anatomical and physiological features birds and mammals have in common are possessing a spinal cord and vertebral column, four-chambered hearts and warm-bloodedness. Birds and mammals also both generally invest a gre... More » Science Biology Zoology
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