Gorryl slug
From Wookieepedia, the Star Wars wiki.
Gorryl slugs were indigenous to Kashyyyk.
They were large carnivores that hung from tree branches waiting to fall upon prey below. Wrapping its body around the prey, a slug would exude digestive juices, dissolving its prey to absorb nutrients. It was not only surely lethal to be attacked and slowly eaten by this creature, but it was extremely slow and painful. Most of the creature's deadliness came from the fact that it was nearly impossible to remove from its prey once it had attached itself.

