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Sharks are really serious animals. They've been around longer than dinosaurs. They're basically prehistoric killing machines, and that's terrifying and fascinating, at the same time.

For a photographer, sharks are a stirring subject, possessing a perfect blend of grace and power. They have been sculpted by evolution and are ideally suited for whichever ecosystem they inhabit, from coral reefs to the open ocean.

Many people continue to think of sharks as man-eating beasts. Sharks are enormously powerful and wild creatures, but you're more likely to be killed by your kitchen toaster than a shark!

Sharks are being driven to extinction because people want to eat their fins and their flesh.

Without sharks, you take away the apex predator of the ocean, and you destroy the entire food chain.

I still think there's a big part of the population that has a lot of misinformation about sharks. But I think it's beginning to change a little bit. As good information about sharks permeates popular culture, things may start to change.

Sharks are beautiful animals, and if you're lucky enough to see lots of them, that means that you're in a healthy ocean. You should be afraid if you are in the ocean and don't see sharks.

Remove the predators, and the whole ecosystem begins to crash like a house of cards. As the sharks disappear, the predator-prey balance dramatically shifts, and the health of our oceans declines.

The biggest predator of fish like cod is other fish - and seals keep fish like that in check.

Some eco groups suggest that as many as 73 million sharks are killed globally every year. Hammerheads, blue sharks, mako sharks - they're disappearing, and they ain't coming back.