Earth Day

A transparent sea cucumber, identified as Enypniastes, is seen at a depth of 2,750 meters (9,200) in the northern Gulf of Mexico in this undated handout photo released November 22, 2009. The permanent darkness of the ocean depths is home to a far greater range of animals, from luminous jellyfish to tubeworms that live off oil seeping from the seabed, than previously thought, scientists said on Sunday. REUTERS/Larry Madin/Handout (MEXICO ANIMALS SCI TECH IMAGES OF THE DAY ENVIRONMENT) NO SALES. NO ARCHIVES. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS