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A bird has to have feathers, hollow bones, and be warm-blooded. So if a bird has those characteristics it is a bird.Lay eggs and birds are Vertebrates.

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13y ago
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4mo ago

Birds are defined by unique characteristics, such as having feathers, beaks, and laying hard-shelled eggs. They also possess hollow bones, a high metabolic rate, and a specialized respiratory system that includes air sacs. Birds are the only living animals with the ability to fly.

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15y ago

The primary characteristic of animals is that they are multicellular organisms that eat other organisms. Birds are multicellular and eat other organisms.

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15y ago

feathers, beak, lay eggs

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Q: What makes a bird a bird?
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