Two sperm whales died within seven days of each other in the Florida Keys, according to state and federal officials. One was a juvenile whale that died May 4 off Key Largo. The other, a large adult that died after beaching itself near Mud Key, about 15 miles northeast of Key West in the Gulf of Mexico, was found on Tuesday, according to state wildlife officials. The adult whale, a male, was towed to Robbie’s Marina on Stock Island, just east of Key West. Kelly Richmond, spokeswoman for the Florida Fish and Wildlife Conservation Commission, said the whale is 47 feet long. “We just started a nec…