Carnivorous caterpillar of the moth Eupithecia orichloris (only common name I can find is “Measuring Worm”) native to Kauai, Oahu, Maui, Lanai and the big island of Hawaii.

They hunt for prey by disguising themselves as twigs and waiting for insects to trigger sensitive hairs on their backs which prompts them to swing around and grab their prey.

Forget spiders, millipedes, ticks. These guys win the ‘most terrifying bugger on Earth’ award. 

Something about it just looks wrong. 

(still a pretty awesome monster though, damn)