TIP: Be very careful when trying to build a mixed exhibit with California Sea Lions, as they are completely psycho. They'll stalk, and kill, anything from penguins to dolphins. I recommend mixing them with the West Indian Manatee, as I built up a nice little exhibit with the two with no problems whatsoever. Needless to say, although I'm not sure about this myself, it might be wise to make a seperate exhibit if the female manatee becomes pregnent, then move her and the new calf into it straight away.