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Females of what mammalian group have mammary glands but lack nipples?

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monotreme

Monotreme eggs have a leathery shell, like the eggs of reptiles. The eggs are retained inside the mothers body for at least a couple of weeks. During that time, the mother provides the eggs with nutrients. Platypus females lay their eggs in a burrow. Echidna females have a pouch in which they store their eggs. Female monotremes have mammary glands but lack nipples. Instead, they sweat milk from a patch on their belly.

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