Frogfish mimic surrounding sponges by varying its background hue to match that of the dominant sponge in the area. This tropical fish is a voracious ambush predator that’s sedentary most of the time. Once settled it starts extending its “lure” – a modified spine whose top resembles a small worm, shrimp or fish – and wiggles it around to attract prey. As those venture close, the frogfish sucks in its unsuspecting prey with a large gulp that’s one of the fastest bites in the animal kingdom.