Hook Mountain: since 1971
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.
|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 . . . .
Updated 01/12/2016, Trudy Battaly