What is the difference between mammals and reptiles?

Mammals are distinguished by the following characteristics:
– warm-blooded;
– mostly viviparous (the exception is the families of echidnova and platypus, they lay eggs);
– the young are fed with milk.

– cold-blooded;
– mostly oviparous (with the exception of a viviparous lizard);
– do not have milk.

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