The peregrines started the day off under overcast skies, with with winds from the SW at 6MPH, and temp at 57F.  The day ahead calls for partly sunny skies, with a high near 75. Southwest wind 7 to 11 mph. Very nice!

In their fourth week of life, the chicks undergo significant changes almost daily.  Around day 25, the brown tips to the secondaries become clearly visible, and the number of colored feathers visible on the breast increases noticeably.  Behaviorally, they are rarely resting on their tarsi anymore at this age. IN this image, the chicks are loafing in the nest box, and the female is perched looking in…..notice the changes in feather coloration.

In terms of feeding times, the pattern is irregular overall.  The young are twice as likely to be fed during the early morning and evening periods than middle of the day.  There tends to be a higher frequency of feeding visits during morning or late afternoon/early evening.  Interval times between feeding visits usually averages about 2 hours, and average duration of a meal runs about 8-11 minutes, with duration of meal time increasing a bit as the chicks get older. Here we see a late day feeding just before 7:30 PM, with sunset at 8:18 tonight.

Literature cited:

Ratcliffe, D. 1993. The Peregrine Falcon. 2nd ed. Carlton, England: T. and A. D. Poyser.

The Canadian Peregrine Foundation, Peregrine Falcon Development – Age Guide; http://www.peregrine-foundation.ca/info/ageguide.html

This morning the peregrines began the day with overcast skies, winds from the NE at 3MPH, and temp at 55F. The day ahead calls for cloudy skies, then gradually becoming mostly sunny, with a high near 66. Calm wind becoming southeast around 5 mph in the afternoon.

By day 24 the facial pattern behind the eyes is becoming increasingly evident, and some colouration is becoming visible on the upper breast as juvenile feathers develop beneath the down.   The legs are now just about fully developed, and thus banding can take place from this time onward. For these three peregrines, banding is scheduled for the end of the this week.  A number of other chicks in the extended Boston area either have been banded, or are scheduled to be banded.

After the chicks can stand, at 22-23 days, the begging posture becomes more horizontal, though they feed in a normal standing position, and direct themselves at the parent’s beak. At about this age, they will start to regurgitate castings composed of indigestible remains, and wiping of the sides of the beak back and forth against the nest box edges.  Also, at about 24 days, signs of self-feeding became more pronounced with nestlings starting to garb at food instead of just begging for it!

Literature cited:

Ratcliffe, D. 1993. The Peregrine Falcon. 2nd ed. Carlton, England: T. and A. D. Poyser.

The Canadian Peregrine Foundation, Peregrine Falcon Development – Age Guide; http://www.peregrine-foundation.ca/info/ageguide.html

This morning the peregrines started the day with fog and light rain, winds from east at 5MPH and temp at 52F.  The day ahead calls for showers before 2pm, then showers likely with areas of drizzle between 2pm and 3pm, then areas of drizzle with a chance of showers after 3pm. Patchy fog before 5pm. High near 52. Northeast wind around 8 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

The chicks are approximately 22 days old.  As we watch these chicks, the amount of black protruding along the edge of the wing indicates that the flight feathers continue to develop at a rapid rate, but it isn’t until the wing is spread that the state of development can be fully appreciated.  The web cam angle, from above, makes this view of the underwing a bit tough to observe.   The underwing view, when available, reveals that the primaries are barely emerging from their shafts, while the secondaries are already considerably more advanced. Here they are,  all three in active feeding mode again!

Overall, the developing young peregrines tend to live together amicably, and there are usually not any epic battles, which are so characteristic of some other raptors, notably Bald Eagles. Young peregrines are given to socialization with each other in the nest ledge, right up to and well past first flight.

Literature cited:

Ratcliffe, D. 1993. The Peregrine Falcon. 2nd ed. Carlton, England: T. and A. D. Poyser.

The Canadian Peregrine Foundation, Peregrine Falcon Development – Age Guide; http://www.peregrine-foundation.ca/info/ageguide.html

Another beautiful morning…..today the peregrines started things off with sunny skies, calm wind conditions, and temp at 54F just after sunrise at 5:10 AM.  The day ahead calls for more sunshine with a high near 82. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 22 mph in the middle afternoon hours!

Over the past few days, the chicks have shifted to the north end of the nest box, up and under the web cam.  At times, it looks like no one is at home, and yet they are there.  Last year, a number of frantic emails came in with alarm and concern that somehow the chicks were gone…..not!  This morning, same thing, just out of sight, but with the female, with her tail just visible, out near the end of the perch pole, keeping a close eye on her little ones.  The unhatched egg remains intact through it all, and the nest box continues to be littered with feather debris from left over meals.

Just after 6:30 AM, the female returned to the nest box with a morning meal.  At first she met the chicks in the lower left hand corner and then the female moved to her right and more towards the middle of the box.  This allowed for a fuller view of all three chicks.  It provides a nice perspective on how the chicks have grown larger, yet still are somewhat patient when being fed!

Literature cited:

Ratcliffe, D. 1993. The Peregrine Falcon. 2nd ed. Carlton, England: T. and A. D. Poyser.

The Canadian Peregrine Foundation, Peregrine Falcon Development – Age Guide; http://www.peregrine-foundation.ca/info/ageguide.html