The crural gland produces a venom secretion containing at least nineteen peptides, in addition to non-protein components.
2.
Female platypuses, in common with echidnas, have rudimentary spur buds that do not develop ( dropping off before the end of their first year ) and lack functional crural glands.
3.
The venom is produced in the crural glands of the male, which are kidney-shaped alveolar glands located in the upper thigh connected by a thin-walled duct to a calcaneus spur, or calcar, on each hind limb.
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