Birds. If I had to choose, I'd rather be trapped in a room with a million rats than one bird.
The only time I forget my shyness is when a pigeon comes near me and I start screaming hysterically.
I also have a fear of dogs. It's weird though as I never had a problem until recently. When I was a kid (like 2 or 3) I was bitten on the face by a dog and still have the scar under my nose but I was never phobic growing up. But then recently this rather large dog jumped up toward my face and it seemed to trigger a memory of the old bite that has left me afraid of them now.