Predators always look like predators. By their coloration, they blend into the background, making them difficult to spot, and therefore dangerous.
Over time, most prey has developed some sort of defense; grouping into herds, the strength of numbers, or their own camouflage. But some prey have developed the means to be particularly dangerous to the predator, a sort of natural �right back at you�. Small, helpless looking creatures have become poisonous, venomous, deceptive killers, capable of killing predators several times their size. And how are these defiant prey creatures identified? By an almost universal system: their bright, vibrant coloration.
One would have thought the red hair and eyes would have given it away.