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The only mammals which lay eggs are the monotremes. These include the platypus and the two species of echidna, the short-beaked echidna of Australia and the long-beaked echidna of New Guinea.
In the case of the platypus, the eggs are about 11 - 15 mm in size, or about the size of a grape. Interestingly, only the left ovary is functional. Also, while the mother produces milk, she does not have teats.
The echidna lays eggs which are about the same size.
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Wiki User
∙ 13y ago
Wiki User
∙ 12y agoThe two egg-laying mammals, or monotremes, the platypus and the echidna, lay very small eggs. These eggs are around the size of grapes.
The platypus's egg averages 11 mm in diameter, and they are rounder than the echidna's egg. The echidna's egg ranges between 13 and 15 mm in length.
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