It was a Bear
A female black bear and her cub were spotted on the seventh fairway this morning, around 10:45 a.m. Golfers were already into their final rounds then, but the first player off, Kevin Sutherland had not yet reached the 479-yard par 4, which has a large wooded area on the right side of the fairway.
Marshals called for security and a law enforcement official came to the seventh hole with a taser gun, but by the time he arrived the bears had already returned to the woods. They were never found again and no one was bothered.
It is not the first time that a bear had been on the course, but it is believed to be the first time since 1994 that a bear, Golden or black, has been on the seventh fairway during a U.S. Open.