Meet the Iberian Ribbed Newt. It can dislocate its ribs and pierce its skin with them to use them as poisonous weapons. Which is freaking awesome! And it has been to space, which is also awesome.
The newts have skin that heals quickly and are immune to their own poison, which is good if you’re going to pierce your own skin with poisonous barbs.
Apparently people keep these things as pets, which is kind of insane — though I’d argue less insane than owning a python.*
*More can be read about the science of the newt here.