WARNING: GRAPHIC IMAGES IN VIDEO
Some beaches in Chatham have been closed due to shark sightings and now, more evidence of the presence of sharks on Cape Cod.
This photo of a seal washed ashore after being bitten by a shark was taken near Monomoy Island.
Marine biologist and shark expert Dr. Greg Skomal says that the bite comes from a Great White shark. Based on the diameter of the bite, Dr. Skomal believes the shark is 14 to 16-feet long.
The seal was not killed immediately by the shark and, most likely, escaped to the shore before dying.
Beaches on the ocean side of Chatham were indefinitely closed to swimming last week after increased shark activity along the shore.
North Beach, North Beach Island and South Beach are closed to swimmers.
The last fatal shark attack in Cape Cod was in 1936.