As "trap hunters" frogfish often lie in wait for passing fish to come in close before BAM opening it's mouth so fast, up to 1/6000 of a second, creating a vacuum of water and sucking the fish in whole. These fish do not have teeth (more like sandpaper jaws) so they suck the fish in whole. Because they rely on camouflage and do not move much, the best place to find them are on coral bommies (rocks covered in coral), on sponges, or in the sand / coral rubble; which are traditional fish nursery areas.