Bald Eagle

Hook Mountain:  since 1971

 

interpretation                                                                                  about the trend lines

Yearly trends for Bald Eagles at Hook Mountain:  A Success Story!

Interpretation (GRB):

Record Numbers:  Bald Eagles are increasing, and have been increasing since the Hook Watch began in 1971.  This graph suggests that the growth is exponential, which is likely a consequence of the time frame for our data.  Bald Eagles were almost eradicated by DDT, and our data records their return from endangered to almost common.  Our record count of 170 in 2014 represents only the migrants that we see at Hook.  We see many more flying along the river and in the valley - fishing, escorting migrants through the area, or just hanging out.

Bald Eagles at Hook:  1988- 2003

About the trend lines:

The trend lines have not been tested for significance. Their intent is to provide an overview of the general trend.   The graphs show two trend lines:  1971 - present, and the last 10 years.  The Hook Mountain Hawk Watch began in 1971, and the points with blue markers indicate the totals for all these years.  The points that show red squares around the blue markers represent the last ten years, showing the trend in this last decade.  The dashed green line shows the average for all years.        more about trend lines . . . .
 
Species
American Kestrel Merlin Peregrine Falcon
Broad-winged Hawk Red-tailed Hawk Red-shouldered Hawk
Northern Harrier Black Vulture Turkey Vulture
Sharp-shinned Hawk Cooper's Hawk Northern Goshawk
Osprey Bald Eagle Golden Eagle

  
HOOK Since 1971 FIRE NEHW Videos Bat's Bytes

Updated 01/12/2016, Trudy Battaly