The science of shark attacks

By Bjorn Carey

updated 1:08 p.m. ET July 5, 2005

Despite two highly publicized shark attacks last month along the U.S. coast, at least one scientist says it's safe to go back in the water.

In fact, he points out that you're actually in more danger on the way to the beach.

"There are millions of people in the water at any given moment of the day," said John McEachran of Texas A&M University. "When you consider all of the people in the water at the same time, the number of shark attacks is very, very remote."

Every year across the globe, nearly one million people die in automobile accidents. More than 42,000 of those deaths occur in the United States.

Shark attacks resulting in deaths occur much less frequently than car wrecks, but they get much more publicity.

"Shark attacks are like airplane crashes," said McEachran. "The vast majority of airplane trips are safe, but when a crash occurs, it gets big headlines."

According to the International Shark Attack File, in 2004 there were only seven shark related deaths worldwide. That number was even smaller in 2003 and 2002, when four and three deaths were recorded respectively.

Should you get to the beach safely, there are still plenty of bigger risks to your health than a shark attack.

"A greater percentage of beachgoers are injured by jellyfish, stingrays, or hardhead and gafftop fishes, which have poisonous spines," McEachran said. "They are more likely to cause harm than a shark."

Even peanuts, McEachran says, are a greater threat to humans than sharks. About 90 people die worldwide each year from allergic reactions to eating peanuts.

There's a better chance you'll win the lottery than be bitten by a shark.

You're not dinner
Should you be bitten by a shark, it's not just bad luck for you. Sharks don't really like eating humans. They'd rather snack on a seal or sea lion – something with higher fat and energy content. We're too bony.

"Sharks don't eat humans," shark exert Peter Kimley of the University of California, Davis told LiveScience. "They spit out humans. Humans aren't nutritious enough to be worth the effort."

But most sharks don't have very good vision, and sometimes objects like buoys and people look similar to a seal — a shark's favorite meal.

"A human being of course, close to the surface, does a pretty good job looking like a seal, and one on a surfboard does an even better job," George Burgess, curator of the International Shark Attack File told LiveScience. "It's not like they're out there saying 'let's try to find a human today.'"

MORE FROM SCIENCE

Science Section Front

First Jesus-era house found in Nazareth How much real science is in ‘Avatar’? Turkey-sized dino packed venom in its fangs Chimps master first step in controlling fire The decade's highs and lows in science Even bacteria get lonely The shortest day: The science of the solstice Biggest atom smasher begins year-end break Cosmic Log: The year in science Scientists watch deep-sea volcano explode Science Section Front   Add Science headlines to your news reader: