For Yemeni fisherman Fares Abdulhakeem and his friends, the day was like any other as they headed out to sea to earn a living in the war-torn country -- until they hit the jackpot in the belly of a whale. Abdulhakeem related how he was among 35 fishermen who stumbled upon a floating sperm whale carcass in February, about 26 kilometres (16 miles) off the coast of the southern city of Aden. He said they dragged the dead mammal back to shore, where they sliced it open and struck "floating gold", or ambergris, a rare substance formed in the whale's...