You try to climb down, but suddenly a dog starts barking at you and you yelp, hopping back up onto the branch, chattering. You are surrounded by acorns again. Your clothes feel loose. Strange thoughts run through your head. Why did you need to get down? There is food up here. Even a big hole in the tree. Everything you need.
Your ears slowly crawl up the sides of your head, rounding out and shrinking. Your hair itches as it changes texture and recedes, shortening to fur. Suddenly you feel like something bit you on your rear, reaching back, you feel a swelling.
Your nose wiggles in confusion as it shrinks as well.
You grab an acorn with dexterous fingers and half hop, half walk to the hole and stuff it in. You grab another. And this time you can't help but think about how good it smells. Sitting down you hold it between your claws and nibble on it. Your teeth are poorly suited but thankfully they get better, and soon you are munching on the yellow meat of the seed happily.
An immense pressure builds in your pants, you can feel something hair bunched up in there. It makes you want to get on all fours and stick your rear in the air.
It's too much to bear. You put your hands on the bark in front of you and dig your claws in. Your rear sticks in the air, and suddenly you feel a mass of hair filling every part of your pants. Chattering and squeaking you can take it no more, and your pants practically explode off your, a long gray tail standing erect behind you.
With this completely animal appendage, you start to feel really hyper. Tail held erect for balance you begin filling the tree with acorns. You chatter to yourself as your clothes grow around you, or rather, you shrink. You don't need clothes anyways, you have your fur. Frantically you wiggle out of them and scamper protectively to your tree hole. The fact that you just turned into an animal doesn't matter to you. YOU HAVE ACORNS!!!!
You spend the rest of your life in that area of the zoo, one of the many squirrels scampering around the walkways.