Proceed to the posted coordinates to start the cartridge. You will be taken to 6 zones and asked a question that can be answered from signs along the trail about the local birds. Once all the questions are answered correctly, you will be given the location of the geocache. The entire trip will be a little over a mile.
The sign for the 3rd zone is currently MIA. The answer for the question in the 3rd zone is "large."

If you would like to unlock the cartridge on wherigo.com, the unlock code will display in the credits upon completion of the cartridge.
Wherigo™ Cache
Wherigo is a toolset for creating and playing GPS-enabled adventures in the real world. By integrating a Wherigo experience, called a cartridge, with finding a geocache, the geocaching hunt can be an even richer experience. Among other uses, Wherigo allows geocachers to interact with physical and virtual elements such as objects or characters while still finding a physical geocache container. A Wherigo-enabled GPS device is required to play a cartridge. Learn more at Wherigo.com.