Scorpionfish: Scorpaenopsis oxycephalaScorpionfish are stocky ambush predators that rely on stealth to disguise their presence. Most species not only change colors to match their surroundings, but they also grow fleshy tabs to enhance their disguise. Once sighted, however, the animals seldom move, allowing a close approach and prolonged observation. Like most lie-in-wait predators, scorpionfish yawn widely from time to time. It is not known exactly why, but the monstrous gapes leave a lasting impression. Stay alert, photographers: If a scorpionfishfish yawns once, it often yawns a second time in rapid succession.