Muraenidae

slithering through underwater tundras
weaving in and out of crevices and rocks
swaying with the movement of the oceans
resembling muscular aquatic crocs

relying on motion and smell to hunt
to scourer the terrain for some prey
while seeking a nook to hide in and wait 
eels are able to sense all they survey

solitary eel swimming silently
rippling dorsal fin runs down its back
powerful jaws, perfect killing machine
survival instinct complete, ready to attack!