Whale Sharks: Memory Test - Smart Sharks - Swimming with Roboshark - BBC

Sir David Attenborough introduces Whale Sharks as they gather once a year at a specific off-shore reef. Amazing wildlife footage from the BBC documentary Smart Sharks: Swimming with Roboshark. Visit http://www.bbcearth.com for all the latest animal news and wildlife videos and watch more high quality videos on the new BBC Earth YouTube channel here: http://www.youtube.com/bbcearth