Officials are trying to determine what caused the death of a manatee in Cape May County.

The 11-foot male was found along the Delaware Bay in Middle Township on Sunday.

Manatees usually are found in Florida's warmer coastal waters. Jay Pagel, of the New Jersey-based Marine Mammal Stranding Center, tells WCAU-TV usually when manatees are found deceased in this area it is somehow associated with cold water.

The center suspects the manatee has been dead for at least a month. The Rutgers Cape Shore Laboratory is helping with the investigation.