There are certain animals we expect to be dangerous, and we meet and treat them with respect and caution. But then -- there are the animals with a surprising dark side.

What could be more adorable and more a symbol of sweetness than the Koala Bear. Well, guess again, folks. They are surprisingly aggressive and have a vicious bite. Just ask Mary Ann Forster, who when protecting her two small dogs from a crazed Koala, was bitten so badly that it took emergency responders to remove it.

And what about Dolphins? The clowns of the ocean? Those of us raised on "Flipper" can only be horrified by the behavior of dolphins. Male dolphins are known for slaughtering other dolphins, and there is filmed evidence of them playing Dolphin Volleyball with baby sharks.

And we know just how those baby sharks feel when we are attacked by advance players, don't we? Ouch! My goodness, our only defense is improving our game. Let's get to work.