I have not done this, but the question was asked on the Theme Parks Board and this was one of the answers. I have forwarded the information to a few friends, and this is something we would like to see!
It concerns the Animal Kingdom:
Bobbi
If you have the luxury of staying until closing, try to be on the Pangani Forest trail about 15 to 30 minutes before closing.
The gorilla bachelor troop, on the left of the trail has to be brought in for the night in a very specific order, due to dominance issues.
For this reason, the animals need to position themselves in specific places in the habitat. To accomplish this, the handlers will be on the trail with you, rewarding the big guys with food for being in the right place - tossing them oranges or bananas for waiting their turn.
During this half hour, as they sort themselves out, it isn't uncommon to see them occasionally charge each other to establish the pecking order. They sometimes accompany this with amazingly loud chest beating - and no, this isn't some silly stereotype from Tarzan movies - it actually happens.