Most mammals do not lay eggs; they give birth to live young. However, there are exceptions. The monotremes, a group of mammals that includes the platypus and echidnas, are egg-laying mammals. These unique creatures lay eggs instead of giving birth to live young like most other mammals.
The early ancestors of mammals were egg-laying creatures. Mammals evolved from reptile-like ancestors during the Mesozoic Era, around 225 to 65 million years ago. Some of these early mammal-like reptiles laid eggs, similar to modern-day reptiles. Over time, however, mammals diverged from this egg-laying reproductive strategy, and most evolved to give birth to live young. The monotremes, such as the platypus and echidnas, are the only remaining egg-laying mammals today, representing a primitive characteristic that has persisted from early mammalian evolution.

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