Jersey (English Channel Islands) has mixed Aye-aye and Jumping Rat successfully.Giant otters would absolutely harm or harass the manatees
Fox and tapir should be fine, although you would need some spots for the foxes to get away from the tapirs
Aye-Aye/Malagasy giant rat should be fine, as Amersfoort mixes Malagasy giant rats with Slow lorises and Galagos
Giant pandas really can't be mixed, they're too aggressive
As Daktari said, building an aviary with the space to house giraffes and buffaloes would have to be incredibly big and very expensive, and it would just end up still being a trampling risk to the Secretary birds
Not only would I not trust Giant Pandas with Takin, I wouldn’t trust the Takin either!
Agree with comments above about risks to Manatees and Secretary Birds!