Bedford Audubon Society

A Northern Westchester & Eastern Putnam Counties, New York Chapter of the National Audubon Society

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Chestnut Ridge Hawk Watch - 2000
By Tait Johansson

The Chestnut Ridge Hawk Watch in Bedford, Westchester County, New York conducted its 18th annual official count of migrating raptors from August 30 to November 20, 2000.

Seasonal Summary
Click for Species Accounts

A total of 17,625 migrating raptors and vultures of 16 species was recorded in the 2000 season. There was a total of 74 days of observation in this 83-day span, for a total of 510 observation hours. This works out to about 6.9 hours per day covered. Missed days were the result of bad weather, generally rain (and at least one day with dense fog that produced very reduced visibility). Highlights of the season included new single-season records for both Black Vulture and Turkey Vulture. The rarest raptor/vulture observed was a single light-morph immature Rough-legged Hawk, on October 31, an otherwise unremarkable day of migration.

August
Official Hawkwatches were conducted on two days in 8/30 and 8/31. South winds and hot, humid weather resulted in only 7 total migrating raptors for August.

August totals
Osprey - 3
Red-shouldered Hawk - 1
Broad-winged Hawk - 3
Total birds: 7
September
There were 27 days of coverage in September. This month brought the bulk of the Osprey, Bald Eagle, Broad-winged Hawk, and American Kestrel migratory movements. The most spectacular of these movements was far and away that of the Broad-winged Hawk, easily this hawkwatch's most abundant species. Of the month's total of 12,591 birds, a full 11,088 were Broad-winged Hawks (just over 88%).
September totals
Black Vulture - 4
Turkey Vulture - 13
Osprey - 215
Bald Eagle - 13
Northern Harrier - 34
Sharp-shinned Hawk - 571
Cooper's Hawk - 75
Northern Goshawk - 6
Red-shouldered Hawk - 4
Broad-winged Hawk - 11,088
Red-tailed Hawk - 9
American Kestrel - 344
Merlin - 10
Peregrine Falcon - 6
Unidentified Accipiter - 116
Unidentified Buteo - 5
Unidentified Falcon - 13
Unidentified Raptor - 65
Total birds: 12,591
October
There were 28 days of coverage in October, with a total of 3,715 birds recorded. The peak movements for Turkey Vulture, Sharp-shinned Hawk, Cooper's Hawk, Red-shouldered Hawk, Merlin and Peregrine Falcon occurred in this month. The reduced total number of birds from September is largely due to the fact that Broad-winged Hawk migration tends to end abruptly in early October in the Westchester county area, and this year was no exception. Even though our second highest day for Broadwings (2,646) was as late as 9/22, only 5 Broadwings were seen from the watch in October, compared with 11,088 the previous month.
October totals
Black Vulture - 11
Turkey Vulture - 1,345
Osprey - 101
Bald Eagle - 8
Northern Harrier - 47
Sharp-shinned Hawk - 1,249
Cooper's Hawk - 238
Northern Goshawk - 5
Red-shouldered Hawk - 45
Broad-winged Hawk - 5
Red-tailed Hawk - 240
Rough-legged Hawk - 1
Golden Eagle - 2
American Kestrel - 193
Merlin - 31
Peregrine Falcon - 10
Unidentified Accipiter - 101
Unidentified Buteo - 17
Unidentified Falcon - 13
Unidentified Raptor - 53
Total birds: 3,715
November
There were 17 days of coverage in November, with a total of 1,309 birds. The peak migratory movement for Red-tailed Hawk occurred early in this month. Although numbers of all species steadily fell off after this, numbers (particularly of Red-tails and Turkey Vultures) were higher than usual in the final few weeks of the season, probably due to an exceptional number of days with strong North and Northwest winds during this period. These winds were often very strong, often consistently 15-20 mph throughout the day, with gusts to 30. Although these winds seemed to improve conditions for Red-tails and Turkey Vultures (at least compared to a day with little or no wind), this unusual weather may be one reason for the fairly small total of Red-shouldered Hawks this season. Red-shouldered Hawks are much lighter than both of these other species, and winds this strong make it very difficult for them to control their flight, and it seems likely that in conditions like this, they take a different route (get blown down to the coast, maybe, as Broadwings seem to do), or perhaps delay migrating. Certainly we tended to see disproportionately fewer Red-shouldereds on very windy days this season.
November totals
Black Vulture - 3
Turkey Vulture - 670
Osprey - 5
Bald Eagle - 4
Northern Harrier - 8
Sharp-shinned Hawk - 39
Cooper's Hawk - 21
Northern Goshawk - 4
Red-shouldered Hawk - 34
Red-tailed Hawk - 487
Golden Eagle - 2
American Kestrel - 1
Merlin - 1
Unidentified Accipiter - 8
Unidentified Buteo - 22
Total birds: 1,309

Click for Species Accounts

2007 Hawk Watch     2001 Hawk Watch

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