Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Reinsen,
J.V.
1974
Northern Shrike
Lanius excubitor
Dec.28 Barr Lake to Main Segs., Colo.: 1a at Barr Lake, Adams Co.
+ 1a in Weld Co. Deep undulations in flight like a woodpecker - unlike straight, rapid-wingbeat flight of loggerhead.