14. Ghost Shark
The ghost shark got its name for two reasons; one, it looks like it’s dead (and its lack of color confirms that); and two, it’s so rarely seen it can barely be studied. The little we do know about them is that they’re around three feet long and they don’t have many teeth (so their prey is of a smaller size). David Ebert, the most recent man to film one of these creatures, said that they seem to be rather curious, despite their rare interactions with humans; the particular shark he was filming kept bumping his lens and returning to repeat the action.