Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
81
Tyrannus vociferans
Nov. 6-10 Casita, 40 km S Nogales, 3300 feet, Sonora.
Noted daily; common, occurring as individuals and in small drifting flocks.
Not recorded in winter north of Hermosillo or later in the fall than Oct. 23, on the Santa Cruz River. The birds at Casita did not vary much in numbers from day to day, and may have been winter visitors.