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A look at how bats avoid bumping into each other at night. Why a bottlenose dolphin seeks out the help of a scuba diver. Ae cicadas expert mathematicians.

A look at why a herd of wild elephants check into the same hotel every year and what is causing giant bubble rings off the coast of Portland, Maine.

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 synchronise swim.

A look at why a pair of giraffes turned white in Kenya, and why the world's fastest land animal is not always successful when hunting.

A look at why crows leave gifts in suburban Seattle; how it's possible a shark can be older than America. Find out 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.