LONDON - APRIL 07: School children try to touch a Southern Stringray as it swims past them at the Sea-Life London Aquarium on April 7, 2009 in London, England. The newly refurbished aquarium costing 5 million GBP houses thousands of creatures representing 500 species including the world's largest collection of Cownose rays and over 10 species of shark. Housed in 2 million litres of water with 65 displays the Aquarium is also a leading centre of marine conservation in the UK. (Photo by Peter Macdiarmid/Getty Images)