developed this characteristic uniquely, the platypus simply inherited this characteristic from its ancestors. Rather than being a unique outlier, the platypus is the last demonstration of what was once a common mammalian characteristic, and it can be used as a model for non-therian mammals and their venom delivery and properties.

Spur and crural gland

The venom is produced in the crural glands of the male, which are kidney-shaped alveolar glands

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