We're sad to hear this, but at least he lived a nice, long life!
The Toledo Zoo's 36 year old gray seal Neptune has died due to age-related health problems.
Neptune was known for his work with the U.S. Navy from 1975 to 1978, during which time he assisted with Navy tasks such as "retrieving tolls and equipment for divers, identifying mines, and locating submarines."
He was donated by the Navy to Connecticut's Mystic Aquarium in 1978, and he made his way to the Toledo Zoo in 1999.
Rest well, Neptune! You will be missed.
[Image via The Toledo Zoo.]