 <unk> harvesting became a dangerous business . The <unk> Society became concerned with the amount of hunting being done in <unk> in the mangrove forests . In 1902 , they hired a <unk> , Guy Bradley , to watch the <unk> around <unk> Lake . Bradley had lived in <unk> within the Everglades , and was murdered in 1905 by one of his neighbors after he tried to prevent him from hunting . Protection of birds was the reason for establishing the first wildlife refuge when President Theodore Roosevelt set Pelican Island as a sanctuary in 1903 . 
