Some prey animals, like rabbits and deer, feature flashy white tails, because they confuse predators:
Because these white tails are very noticeable, predators focus on these bright spots — but at the expense of focusing on the larger animal. When a rabbit or deer executes an evasive maneuver, like a sharp turn, the spot suddenly disappears, causing the predator to readjust its focus on the camouflaged coat. This will cost it some vital time, giving the prey animal those precious added seconds to escape.
And fascinatingly, Semmann tested his theory by having 24 humans play a video game in which they attempted to follow a virtual rabbit both with and without a flashing tail. As suspected, the presence of a tail significantly reduced their number of correct moves.