The superintendent of the Sagamore Hill National Historic Site, Thomas Ross, says the tusk was one of a pair displayed on a fireplace mantel. It was discovered missing Feb. 22 from a second-floor guest room in the Oyster Bay, N.Y., home. The room is usually sealed off by a rope when visitors take guided tours.
Old Brookville, N.Y., police and the National Park Service are investigating. The FBI has added the tusk to its national stolen art list.
Several years ago, a man stole Roosevelt's revolver from the house. He pleaded guilty, and the weapon was returned.
