Shelbyville Bird Sanctuary is a bird sanctuary in Shelbyville.
Homer and Marge put the GPS system into Bart's new cellphone and were able to find out where he was going. When Bart learnt it, he took the GPS chip out and tied it to a bird's leg.
The bird started flying around Springfield, which confused Homer and Marge. Then the bird left the town and flew to the bird sanctuary in Shelbyville, which it circled for a while.