Possibly the next Queen song to be ripped off by Justin Bieber…. This is a scorpionfish playing the perfect waiting game. They change colour to match their surroundings and then sit and wait, and wait and sit…. until a wee fish swims in front of their mouth. Suddenly the mouth will open wide, creating a suction effect. Now you see it, now you don’t.
Stonefish and frogfish do pretty much the same thing and again they are insanely camouflaged. I’m sure I swim past at least one frogfish every time I dive on the housereef.