It happens every summer in Colorado on eBird: reports of "Northern" Shrikes. Never say never but Northern Shrikes do not show up in Colorado until November most years, and after wintering, usually leave in March-April. In summer, Loggerhead Shrike fledglings can somewhat resemble Northerns in that their mask is thinner, not dark black and they often in good close views show subdued scalloping like Northerns. The shrike "party of 7" reported at the Rocky Mt. Arsenal today was a family of Loggerheads. Easy mistake to make if one isn't looking at the calendar. Easy to correct if one IS looking at the calendar.
Recently fledged juvenile Loggerhead Shrike on 22 June in Weld County, CO. Note somewhat reduced extent of mask (compared to an adult) and the scalloping on the breast and crown.
Another recently-fledged Loggerhead Shrike on 18 June showing a rather narrow mask that is not dark black, scalloping on breast and crown, and the lower mandible is somewhat yellowish like a young Northern.
Dave Leatherman
Fort Collins
No comments:
Post a Comment