Dathomiri rock dragon

The Dathomiri rock dragon are large reptiles native to the planet Dathomir which possesses rough mottled skin which allows it to blend in with its surroundings. Being a reptile, the rock dragons were egg layers and cold blooded, which required them them to nest around the eggs to keep them warm. Their natural camoflage allowed them to blend in with their environment. Their diet consisted of insects and plants but, when threatened, they could inject a powerful poison from a stinger to protect themselves. This poison was strong enough to kill a fully grown Rancor.

Source

 * Shard of Alderaan