A farmer and horse breaker marches a horse during routine practice on his farm in the outskirts of Havana April 10, 2011. [Photo/Agencies]

Aurora (L) and Victoria, one-year-old female polar bear cubs, play near a swimming pool which was filled with water for the first time this spring at the Royev Ruchey zoo in Russia's Siberian city of Krasnoyarsk, April 14, 2011. Two female wild polar bear cubs were found in Russia's Taimyr Peninsula on the Arctic Ocean coast in May 2010 and were later housed at the zoo in Krasnoyarsk. [Photo/Agencies]

Baby chicks rented from Legare Farms near Charleston, South Carolina appear in an undated photo, released to Reuters on April 10, 2011. A small South Carolina sea island family farm that has tapped the growing agriculture tourism market in order to survive has launched its "Rent-A-Chick" program just in time for Easter. And for the next two weeks, in the run-up to Easter, several hundred Rent-A-Chicks will go out in pairs to local families. [Photo/Agencies]