A 27-year-old harbor seal at the Chaffee Zoo died Tuesday night, zoo officials said.
Zoo officials said they noticed a decline in health in the harbor seal named Buck over the last couple of days. Buck was considered an older harbor seal -- longevity is about 35 years for females, 25 years for males and longer with captive animals.
Buck came to Fresno Chaffee Zoo in 2004 from Six Flags Worlds of Adventure, zoo officials said in a news release. Buck shared a habitat with three sea lions and a female harbor seal.
Zoo officials said a preliminary necropsy is underway and final laboratory results regarding cause of death will not be available for several weeks.