Goldeneye: Alpha Code Dictionary is a free Chrome add-on developed by tessa.rhinehart. This add-on is designed to help users look up bird species by their 4-letter alpha code or common name.

With Goldeneye, users can easily search for alpha codes, common names, species with potentially confusing alpha codes, and codes that are not in use due to conflicts. The add-on supports all species, subspecies, species complexes, and named hybrids included in the Bird Banding Laboratory (BBL) and Institute of Bird Population's (IBP) alpha code lists. In cases where different codes are used for the same species, Goldeneye provides information about the other codes.

Goldeneye: Alpha Code Dictionary is also available as a website at alphacodes.net. The add-on is a valuable resource for bird enthusiasts, researchers, and anyone interested in learning more about North American bird species and their alpha codes.

Please note that the icon and banner image for this extension feature a painting of a Barrow's Goldeneye by Cayenne Sweeney. The extension itself was written by Tessa Rhinehart.