Friday, March 26, 2010

Four eggs! and update about banded male.

Hi All,

The falcons are now incubating four eggs. Eggs were laid on March 18, 20, 22, and 24. Egg #5 could appear today! Last year these falcons laid only four eggs but it is not out of the question for falcons to lay up to six eggs!

Also, I am excited to pass on some additional information about the banded male of this pair. As you know the male at this nest has a black over green band (with codes B/S) on its left leg and a silver Fish and Wildlife band on its right leg. Chris Martin of NH Audubon has provided an update about the history of this bird--he hails from New Hampshire and is in his sixth year!

From Chris Martin, Senior Biologist, New Hampshire Audubon:

Black/green B/S was 1 of 4 chicks fledged from the Brady-Sullivan Tower in downtown Manchester, NH in Spring 2005. His mother was raised at the Throgs Neck Bridge in New York City and his father comes from Cathedral Ledge near Conway, NH. Black/green B/S has been confirmed to be associated with this (webcam site) breeding territory since 2007.

In 2007 the falcons at this eyrie fledged one chick. Breeding efforts failed in 2008 but last year, 2009, these falcons again raised one chick...the only chick to hatch of four eggs. This is the second season that we have monitored this nest with BRI Peregirnecam.

Detailed information about individually marked birds is uncommon and difficult to acquire. Although such information is limited, it can be critical for addressing certain questions that relate to the behavior individuals such as dispersal distance, site fidelity, territory size. Can you think of other questions that might be answered by marking individual birds?

Because we banded last year's chick we may have a chance at tracking multiple generations of falcons...we just have to hope for the stars to align so that last years fledgling might be observed again somewhere. So, be on the lookout for falcons!

As always please keep in touch with your questions and comments about what you see here. Help contribute to this blog!

All the Best,
Patrick Keenan
BioDiversity Research Institute


  1. How interesting to know where they "came" from! Thanks, Patrick and BRI, for all you do!

  2. Please tell us if the noise on the upstream is the ocean or if it from traffic.