Global fast food chain Burger King will soon be serving up morsels from free range eggs and pigs, the company said in a statement Wednesday. The company -- which has 12,500 locations worldwide -- pledged to use 100 percent cage-free eggs in the US within five years and to only buy pork from suppliers who stop using gestation crates to breed pigs. The pledge was made in a joint statement with the Humane Society. \"For more than a decade, Burger King Corp. has demonstrated a commitment to animal welfare,\" said Jonathan Fitzpatrick, chief brand and operations officer. \"We continue to leverage our purchasing power to ensure the appropriate and proper treatment of animals by our vendors and suppliers.\" The Humane Society, which lobbies for animal rights, welcomed the move. \"These changes by Burger King Corp. will improve life for countless farm animals and encourage other companies to abide by animal welfare principles up and down their supply chain,\" said Wayne Pacelle, head of the group.