Migration Data

Sanctuary personnel record and maintain counts of migrating raptors each autumn and each spring, and also study ovenbird breeding success, survey nesting songbirds, winter birds and butterflies. In addition, staff, volunteers, and visitors play an important role by sharing their wildlife observations, which we record as Nature Notes. All sightings are entered into a database that shows trends over time.

Below are charts detailing an overview of the Migration Counts for Autumn (1934 - present) and Spring (1998 - present) seasons. 

For data on any of our other On-site Studies, please contact Senior Biologist David Barber at 570-943-3411 ext 105 or [email protected]

Hawk Mountain Autumn Migration, 1934-2018

Species10-Year AverageLong-term Average Season Record Record Year Peak Day Peak Date 
Black Vulture142 32 295 2011 85 10/15/2011 
Turkey Vulture599 179 936 2014 300 11/6/1948 
Osprey430 401 872 1990 187 9/18/2004 
Mississippi Osprey0.2 0.3 several several 
Swallow-tailed Kite0.1 <0.1 2007 8/18/2007 
Bald Eagle383 112 546 2018 48 9/4/1950 
Northern Harrier138 216 475 1980 36 several 
Northern Goshawk30 64 347 1972 64 11/10/1973 
Sharp-shinned Hawk4331 4340 10612 1977 2475 10/8/1979 
Cooper's Hawk518 394 1122 2005 204 10/8/1981 
Unidentified Accipiter63 25 137 1999   
Red-tailed Hawk2010 3142 6208 1939 985 10/31/1937 
Red-shouldered Hawk164 258 468 1958 148 10/19/1958 
Broad-winged Hawk8137 8128 29519 1978 21448 9/14/1978 
Rough-legged Hawk31 1961 11/11/1961 
Swainson's Hawk0.4 0.2 1978,1992 several 
Unidentified Buteo39 281311990   
Golden Eagle131 68 173 2012 48 11/3/2012 
Unidentified Eagle0.5 1995  
Peregrine Falcon62 32 88 2014 31 10/5/2002 
Merlin176 70 247 2018 49 10/15/2005 
American Kestral375 394 839 1989 168 9/3/1977 
Gyrafalcon<0.1 <0.1 1934 several 
Unidentified Falcon16 22 2007   
Unidentified Raptor58 78 338 1948   
TOTAL17,891 17,986 40,968 1978 21,496 9/14/1978 

Hawk Mountain Spring Migration, 1934-2018

Species 10-Year Average Long-Term Average Season Record Record Year 
 Black Vulture40 25 118 2012 
 Turkey Vulture29 25 77 2015 
 Osprey83 97 150 2001 
 Mississippi Kite<1 <1 2014 
 Swallow-tailed Kite<1 <1 2013 
 Bald Eagle37 24 75 2017 
 Northern Harrier22 24 49 2013 
 Northern Goshawk0.4 0.6 2006 
 Sharp-shinned Hawk87 107 190 2001 
 Cooper's Hawk42 38 94 2013 
 Unidentified Accipter15 15 38 2001 
 Red-tailed Hawk92 109 160 2003 
 Red-shouldered Hawk20 2008 
 Broad-winged Hawk642 378 642 2017,2000 
 Rough-legged Hawk<1 <1 2013 
 Unidentified Buteo2826 842013
 Golden Eagle2017 
 Unidentified Eagle2012 
 Peregrine Falcon2013 
 Merlin2015,2009 
 American Kestrel19 13 2007 
 Unidentified Falcon13 2007 
 Unidentified Raptor33 33 122 2001 
 TOTAL929 963 1444 2013