Here's some more information:
* Purpose: The spur is believed to be used primarily for defense, especially during mating season.
* Venom: The venom is not fatal to humans, but it can cause intense pain, swelling, and even temporary paralysis.
* Delivery: The venom is delivered through a groove on the spur.
* Females: Female platypuses do not have spurs.
It's a fascinating adaptation that makes this already unique animal even more intriguing!