I don't think this is news to any of our active posters, but to someone who may be a new zoochater not from the area -- Brookfield Zoo also held walrus pretty consistently from the 60s into 2003 or so, alongside the aforementioned fur seals and at other points sea lions. There is still a statue of Olga the Walrus at Pinniped Point as she was one of the zoo's star attractions back in the day.