 Both spiders and scorpions are venomous , so their threat displays can be considered generally aposematic . However , some predators such as hedgehogs and spider @-@ hunting wasps ( Pompilidae ) actively hunt arachnids , overcoming their defences , so when a hedgehog is startled by , for instance , the sounds made by a scorpion , there is reason to describe the display as deimatic . 
