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Platypus venom
The platypus is one of the few mammals to produce venom. Males have a pair of spurs on their hind limbs which secrete venom that is only seasonally active to breeding season, supporting the theory that the use of venom is for competition of mates only, not protection. While the spur remains available for defense outside of breeding season, the platypus's venom gland lacks secretion.〔 While the after effects are described as excruciatingly painful, this venom is not lethal to humans.
==Spur and crural gland==
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. 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. The spur is attached to a small bone that allows articulation; the spur can move at a right angle to the limb allowing a greater range of attack than a fixed spur would allow. The spur normally lies flat against the limb but is raised when required.〔(【引用サイトリンク】title=The venom of the platypus (''Ornithorhynchus anatinus'') )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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