Hedgehogs have a trick up their, errr, “sleeve” to give themselves extra protection – “self anointing.” These amazing animals are immune to certain poisonous plants, which they eat before making a frothy saliva in their mouth. The hedgehogs then lick their spines, spreading the saliva with the plant”s poison all over the spikes. Scientists believe this may help hedgehogs hide their scent from predators, or give them a nasty shock shock should they attack!