At approximately 13:00 hours on 17 June 1969 I saw a Field Sparrow Spizella pusilla clinging to the poultry wire of one of the wings at the entrance of the Heligoland trap on Southeast Farallon Island, San Francisco County, California. This bird was easily driven into the catching-box and secured. At that time the weight of this individual was 12.5 grams, with only a trace of fat visible beneath the skin. Ossification of the cranium was complete.