[CT Birds] Harriers

Carolyn Johns carolyn.f.johns-emp at snet.net
Tue Dec 29 17:37:47 EST 2015


Jim

    That was great information.  Nothing like hard data (albeit not 
significantly sound).
Carolyn

-----Original Message----- 
From: greg hanisek via CTBirds
Sent: Tuesday, December 29, 2015 4:12 PM
To: Jim Zipp ; CT Birds
Subject: Re: [CT Birds] Harriers

For what it's worth (really nothing!) I don' think I ever heard the term 
"Gray Ghost" used for an adult male N Harrier during the 40+ years I lived 
in NJ before moving to CT 20+ years ago. I think Julian touched on this but 
there certainly are plenty of instances of males, females and juveniles of a 
given species having different migration patterns.
Greg HanisekWaterbury

    On Tuesday, December 29, 2015 2:27 PM, Jim Zipp via CTBirds 
<ctbirds at lists.ctbirding.org> wrote:


It's been interesting reading the comments on harrier male/female and 
adult/imm harrier observations.  Thought I'd dig into my old banding files 
from banding a couple thousand hawks in New Haven over a 15 year period from 
1981 until part time banding into 1997 at a banding station Brian Wheeler 
and I operated.

One of the better years for harriers was 1983 (Wow, 32 years ago!)  I 
suspect ratios would be similar if not total numbers.

This is hard data but of course only so much can be drawn from it as there 
are other factors like immature birds being easier to capture than adults 
for instance but here are some numbers.
77    Total Harriers banded between Sept 3rd and Nov 5th (last day of 
banding operations with a snowy owl flying over us)
44% females and 56% males

3      AHY males meaning after hatch year males or "gray ghosts"8      AHY 
females26    HY hatch year juvenile females40    HY juvenile males
Seems that while we caught more males birds overall, we caught far less 
adult males than adult females.  I do not think males got smarter than 
females. If I remember correctly there was some speculation that adult males 
tended to take more inland routes but don't have any data and it could have 
just been a guess at the time.
If anyone cares to see a couple of shots of a sample of the breakdown I put 
a couple of phone shots of an old sample page of data and one of charts done 
the old way rather than today with input and charts computer generated.
http://www.jimzippphotography.com/HawkBanding/
Jim Zipp


The Fat Robin Wild Bird and Nature Shop
3000 Whitney Ave.  Hamden, CT 06518
www.fatrobin.com
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Jim Zipp Bird Photography   www.JimZipp.com
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