The venom-delivering spur is found only on the male's hind limbs.
The platypus is one of the few living mammals to produce venom. The venom is made in venom glands that are connected to hollow spurs on their hind legs; it is primarily made during the mating season.[1] While the venom's effects are described as extremely painful, it is not lethal to humans.
Many archaic mammal groups possess similar tarsal spurs, so it is thought that, rather than having developed this characteristic uniquely, the platypus simply inherited this characteristic from its antecedents. 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.[2]
^Cite error: The named reference WPB was invoked but never defined (see the help page).
^Jørn H. Hurum, Zhe-Xi Luo, and Zofia Kielan-Jaworowska,
Were mammals originally venomous?, Acta Palaeontologica Polonica 51 (1), 2006: 1-11
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