The peregrines started off today under overcast skies, winds from the SW at 7MPH, and temp at 55F.

Brooding has usually ceased when the young are three weeks old, and may even do so up to a week earlier. The female spends more time out of the nest box, but always nearby, on the perch pole, or another perch very proximate to the nest box. At night, you will see her typically at the edge of the nest box. Here, her tail feathers are just visible as she perch on outside pole.

As these 23-day-old chicks demonstrate, they alternate between standing on their feet and resting on their tarsi.  The feather debris continues all around the inside of the nest box. The  remaining egg, continues to provide  a reference point for their size.

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