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| Interpretation
(GRB): More Peregrines now than in the 1970s: The number of Peregrine Falcons counted at Hook over the last 37 years has been increasing steadily, but with greater variation than the increase in Merlins. The average count in the first ten years was 5.7, compared to 25 in the last ten years. Peregrine populations have recovered from the crash of the DDT era, and we now have Peregrines nesting in our area. We often see them flying up the river and around the Hook. It can be difficult, sometimes, to determine whether a Peregrine flying towards the west is a migrant or a local that is hunting a large territory. Like the Merlins, it will be interesting to see which direction the trend goes. Will it continue to increase in numbers, or has it begun to stabilize? The next few years should tell us. |
| 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. more about trend lines . . . . |