Nature's Strangest Mysteries: Solved

A look at which animals get the giggles; what would cause the sea lions of San Francisco to mysteriously swim away all at once, manta rays that synchronize swim.

A look at what causes a pair of giraffes to turn white; why are millions of birds creating crazy patterns; why would the world's fastest land animal give up the hunt.

A look at why crows leave gifts in suburban Seattle; how it's possible a shark can be older than America; and who is making the mysterious crop circles at the bottom of the sea in Japan.

A look at why 25,000 honey bees would swarm a hot dog stand in the middle of Times Square; what would cause a healthy bat to hunker down in the snow; how is this crayfish super species threatening to take over the world.