[CT Birds] Red-tailed Hawk and Red-shouldered Hawk, Part III

Stephen Broker ls.broker at cox.net
Mon Jan 19 11:35:50 EST 2015

What about the time factor?  Looking at 5-year time increments (1984-85 through 1988-89, 1989-90 through 1993-94 . . . 2009-10 through 2013-14) for statewide CBC results, the Red-tailed/Red-shouldered ratios change as follows:  28.4 – 26.6 – 16.8 – 15.4 – 10.0 – 5.9.  Here is seen the more rapid growth in Red-shouldered Hawk numbers over a thirty-year period.  If one goes back even further to the decade of the 1950s, Connecticut statewide CBCs recorded greater numbers of Red-shouldered than Red-tailed Hawks in 7 of 10 years.  But, Red-tailed Hawk numbers began to take off in the early 1960s, continuing through the 1970s and on to present day.  Red-shouldered Hawk numbers stagnated or dropped for several decades and began their resurgence only in the late 1990s and early 2000s.  Band of band-tailed brothers and sisters.  To be continued.

Steve Broker

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