I was snorkeling recently when I saw this Dwarf Moray Eel hunting with a small Saddle Wrasse. It promptly disappeared under a rock and I didn’t expect to see it again. But I was in no hurry, so moved away a bit and kept watch. After a while the eel poked its head out, hesitated, then swam out.
I snapped these two photos, the first as it emerged and the second as it disappeared again. I like how, in the top photo, the eel oozes out of a hole no bigger around than it is, which is less than an inch! These small eels typically are less than a foot long.