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, 1934-2019

Species10-Year AverageLong-term Average Season Record Record Year Peak Day Peak Date 
Black Vulture133 32 295 2011 85 10/15/2011 
Turkey Vulture625185936 2014 300 11/6/1948 
Osprey413399872 1990 187 9/18/2004 
Mississippi Kite0.10.1several several 
Swallow-tailed Kite<0.1 <0.1 2007 8/18/2007 
Bald Eagle412117546 2018 48 9/4/1950 
Northern Harrier133215475 1980 36 several 
Northern Goshawk2864347 1972 64 11/10/1973 
Sharp-shinned Hawk4111431310612 1977 2475 10/8/1979 
Cooper's Hawk4853931122 2005 204 10/8/1981 
Unidentified Accipiter6525 137 1999   
Red-tailed Hawk197331226208 1939 985 10/31/1937 
Red-shouldered Hawk163257468 1958 148 10/19/1958 
Broad-winged Hawk8165811129519 1978 21448 9/14/1978 
Rough-legged Hawk31 1961 11/11/1961 
Swainson's Hawk0.4 0.2 1978,1992 several 
Unidentified Buteo37271311990   
Golden Eagle13268 173 2012 48 11/3/2012 
Unidentified Eagle0.5 1995  
Peregrine Falcon6032 88 2014 31 10/5/2002 
Merlin17571247 2018 49 10/15/2005 
American Kestrel355 393839 1989 168 9/3/1977 
Gyrfalcon<0.1 <0.1 1934 several 
Unidentified Falcon1522 2007   
Unidentified Raptor5777338 1948   
TOTAL17,539 17,915 40,968 1978 21,496 9/14/1978 

Hawk Mountain Spring Migration, 1934-2020

Species 10-Year Average Long-Term Average Season Record Record Year 
 Black Vulture4331118 2012 
 Turkey Vulture40281392020
 Osprey7493150 2001 
 Mississippi Kite<1 <1 2014 
 Swallow-tailed Kite<1 <1 22014
 Bald Eagle392575 2017 
 Northern Harrier212349 2013 
 Northern Goshawk0.4 0.52006 
 Sharp-shinned Hawk85103190 2001 
 Cooper's Hawk4038 94 2013 
 Unidentified Accipter15 1438 2001 
 Red-tailed Hawk881042072005
 Red-shouldered Hawk820 2008 
 Broad-winged Hawk4113917392020
 Rough-legged Hawk<1 <1 2013 
 Unidentified Buteo3226 842013
 Golden Eagle82017 
 Unidentified Eagle2012 
 Peregrine Falcon32013 
 Merlin65142019
 American Kestrel2026892001
 Unidentified Falcon13 2011
 Unidentified Raptor3433 122 2001 
 TOTAL9879711444 2013