Hook Mountain:  since 1971

A Merlin zooms past in its deliberate and directed flight.

interpretation                                                                                  about the trend lines

Yearly trends for Merlins at Hook Mountain

Interpretation (GRB):

Good News: 
The number of Merlins counted at Hook has slowly increased over the 41 years of the watch, from an average of 15.3 in the first ten years, to an average of 66.6 in the last 10 years. 
During this last decade the count has shown greater variation than earlier.  The
10 year trend line shows a decline, but the extent of variation offers no confidence that a decrease really exists for the last 10 years.  It is possible that the Merlin numbers are beginning to stabilize.  But, it is very curious that more variation is occurring at the same time that Merlin migration numbers are stabilizing. 

Merlin Season at Hook Mtn
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 . . . .
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

Daily Records 2011 2010 2009 2008 2007 2006 2005 2004
HOOK Since 1971 FIRE NEHW Videos Bat's Bytes

Updated 08/29/2022, Trudy Battaly