October 24, 2008—Costa Rica's Cocos Island National Park, nicknamed "Shark Island," has what might be the highest concentration of sharks anywhere. But even here, sharks are vulnerable.Video by Public Television's Wild Chronicles, from National Geographic Mission Programs
Get our news delivered directly to your desktopfree.
How to Use XML or RSS
SPACE PHOTOS THIS WEEK: Tiny Galaxy, Sun's Iron, More
Stuck Mars Rover About to Die?