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Leisuretime70/Thinkstock Pigeons: Homing, Passenger, Carrier and Otherwise

Pigeons can get a little confusing. Passengers, messengers, carriers, homing - the list goes on. But when it comes down to it, they're all variations of the same smart bird with a knack for getting home to roost. Learn about these clever creatures in today's episode.

extinction-sysk-600x350 How Extinction Works

Scientists believe that 99% of the estimated 50 billion species that have ever lived on Earth have disappeared through extinction. This is a natural process typically, but it can also be cataclysmic and it’s becoming clear we are amid a massive one.

© DKAR Images/Tetra Images/Corbis Why should you never scare a vulture?

Being ravenous eaters of decaying flesh, vultures have long been shunned by humans. But because of their disgusting habits, vultures provide a much-needed service to the rest of the organisms on Earth, making them the unsung heroes of their ecosystems.

redhead600x350 How Redheads Work

Redheads are supposedly fiery, passionate people, but is there any truth to these stereotypes? Find out what studies have to say about redheads -- and if they'll really go extinct soon -- in this HowStuffWorks podcast.

Will we soon be extinct?

Is Earth due for a mass extinction? Population ecologists think so. Check out this HowStuffWorks podcast to learn more mass extinctions.

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Watch the latest SYSK shorts on the official video page.

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