Scorpionfish have large heads, large mouths and eyes, and stout, laterally compressed bodies with large pectoral fins. They are bottom-oriented predators that sit quietly on reefs and are extremely well camouflaged. They are best known for their spines that possess some of the most deadly fish venom known. It is a neurotoxin that can be injected by a Scorpiafish by means of venom glands at the base of hypodermic-like hollow dorsal spines.