What Is the Difference Between ‘Mammals’ and ‘Birds’?

Imagine you're at a party where two groups of animals are talking. The mammals say they like to keep their babies close and feed them with milk. The birds say they prefer to lay eggs and fly away on warm winds. That's the big difference, mammals give birth to live young and use milk, while birds lay eggs and can fly.

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Examples

Mammals like dogs give birth to live young and feed them with milk, while birds like chickens lay eggs that hatch later.
A mammal can be warm-blooded even in cold weather because of its hair, but a bird keeps warm using its feathers.
Mammals have mammary glands, so they can feed their babies, while birds lay eggs that become babies later.

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Categories: Biology · mammals,birds,animal classification,biology basics,evolution