Well half the animals weren't even in their exhibi...

Well half the animals weren't even in their exhibits.
If they are open from 10am-5pm that gives employees enough time to take care of the animals either earlier or later.
The majority of these animals are not housed properly.. I think it would be wiser to put nocturnal animals all in one place and animals that are from colder climates in better conditioned exhibits. A lot of people would call this animal neglect.

My concluding thoughts: why not just set these animals free? To their correct habitats of course.