Peregrine Falcons: Haverhill pair

March 9, 2017 in Peregrine Falcons Haverhill

_W7I3451-001The Peregrine Falcons in Haverhill have been spending a lot to time in the local downtown area.  They are frequently found on a number of regular rooftop perches with expansive views overlooking the Merrimack River.  A nest box was put in place on the bridge but it remains to be seen if that will find favor with the female when she prepares to lay her eggs for the 2017 breeding season!  Here the unbanded female takes off in flight from one of the rooftops by the railroad bridge.

Bald Eagles at nest!

March 8, 2017 in Bald Eagle

_W7I3374-001Not sure if the female is hunkered down deep in the nest with the male perched next to the nest.  Sure looks like they are ready to lay eggs and begin the incubation process!

This Bald Eagle nest, like most others, is constructed from large sticks, which are laid together to form the outside part of the nest. The center of the nest is filled with dead weeds, stubble and other softer materials, which may be available in the area. The nest cavity where the eggs are laid is lined with grass, dry moss and feathers. Many Eagle experts believe that some bald eagles show such a strong attraction to their nesting site that, if displaced or overly disturbed, a pair may not return to the nest the following year. This fact places great importance on protecting nesting areas from disturbances such as land development and recreational activities.

Bald Eagle nest: Essex County

March 7, 2017 in Bald Eagle

_W7I3326-001This new Bald Eagle nest may well be used for the first time in 2017.  The nest was completed in the fall of 2015 and the Eagle pair spent a great deal of time around the nest in the spring of 2016.  But it appears that no eggs were ever laid.  This “playing house” is not unusual among  a newly formed pair of Eagles.

It has been stated for many years that a Bald Eagle pair will mate for life, but if one partner dies, or disappears, the other will if lucky find another mate. A newly bonded pair may work several years on a nest before actually breeding. They may desert one nest site and start again somewhere else, usually within 1/2 mile. In Eastern Massachusetts, bald eagles will begin to nest sometime in February or March.  Each nesting pair will spend a great amount of time preparing the nest before any egg is laid. The successful nest is generally located in a large tree, within one mile from water, either a lake or river, where adequate food is available.

Bald eagle nests are generally found from (50 to 120 feet) above the ground, in a tall, sturdy tree. It takes at least two weeks for a pair of eagles to build their nest.

A typical bald eagle nest will range from 6-10 feet in diameter and about 6 to 10 feet high. The nest cavity, where the eggs are laid, will be about 12 to 16 inches in diameter and about 4 inches deep.

A pair of eagles, once established, may use the same nest several times over a period of years. Each year more materials are added to the nest, which increases the size of the nest each year that it is used. Nests weighing up to 2 tons have been found.  Stay tuned!

Peregrine: Woburn female nest ledge

March 3, 2017 in Peregrine Falcon Woburn

_W7I2669-001Another morning visit to the peregrines in Woburn with the female again perched very comfortable at the entry to the nest ledge in bright morning sun.  She has claimed this spot many times and perhaps this will be the location for laying eggs this breeding season.  This will be her first breeding season in this location.

Unlike humans, Peregrine females can choose when to fertilize their eggs. That’s a great advantage in the wild. It means begin the egg production process when she’s selected a safe nest site.

The final step is to prepare the nest. In the wild, a Peregrine’s nest is little more than a depression that’s been scraped out of the dirt and gravel on a cliffside or rocky outcrop. Not surprisingly, bird biologists call this kind of nest a “scrape”.

The courting, mating, and nest preparation behavior continues up until the time the female is ready to lay her eggs. This will hopefully be near the end of March or early April, a bit earlier than last year!