by Dan Casey
The 10th annual hawk migration survey at the Jewel Basin got off to a roaring start; we recorded birds at record rates from late August through Sept. 22nd. But just as we hit our usual peak season, the snows started to fall. As much as we welcomed the early season snow following a smoky fire season, the safety of our (mostly) volunteer workforce eventually pre-empted surveys during what is typically our peak season in late September and early October. Indeed, we managed just 11 surveys in October. Our final survey was conducted Oct 27th, but only because our all-star observer, Barbara Summer, braved the 93-switchback trail from the lower Jewel Basin Road to our alternative (lower) observation site.
How did this season stack up against previous efforts? We tallied 2,313 raptors over 42 surveys, averaging 9.5 birds per hour for the season (see table). That amounts to about 300 fewer birds, and 3 fewer surveys than our previous average efforts. Sharp-shinned Hawk was once again our most abundant species, with 1,024 counted (9-yr average: 1,207), and we had above average numbers of Cooper’s Hawks (390) and Red-tailed Hawks (216) this season, and set new single-season high totals for Bald Eagle (106), Northern Harrier (102), Prairie Falcon (12), and Swainson’s Hawk (3). And although Montana sites had stellar eagle migrations, our Golden Eagle count of just 212 was less than half of our long-term average. We have now tallied 26,248 raptors in 10 seasons at the Jewel Basin site. Our annual report, to be completed this winter, will include analysis of trends over the years and within species.
Thanks to all who participated this year, notably those who served as primary observers: Nickie Broesel, Dan Casey, Josh Covill, Diane Lundgren, Kathy Ross, Barbara Summer, Rod Wallette, and bj Worth. Their dedication keeps this valuable effort going, and our first season of on-site, real-time data entry was a resounding success!
|Turkey Vulture||1||Broad-winged Hawk||10||Merlin||15|
|Osprey||11||Swainson’s Hawk||3||Peregrine Falcon||11|
|Bald Eagle||105||Red-tailed Hawk||216||Prairie Falcon||12|
|Northern Harrier||102||Ferruginous Hawk||0||Gyrfalcon||0|
|Sharp-shinned Hawk||1,024||Rough-legged Hawk||9||Unidentified Falcon||5|
|Cooper’s Hawk||390||Unidentified Buteo||16||Unidentified Eagle||3|
|Northern Goshawk||24||Golden Eagle||212||Unidentified Raptor||15|
|Unidentified Accipiter||50||American Kestrel||78||TOTAL||2,313|
You must be logged in to post a comment.