An unexpected delight to find this adult Peregrine perched on a upper loading door sill on the south side of Pemberton Mill.  the morning was warm, bright, and sunny with little wind.  After a stop to look out over the Merrimack from the Duck Bridge on Union Street, noticed a few feathers falling gently from the mill building.  Falling feathers usually merits a further look!  Sure enough, the Peregrine was found on an old loading door ledge just below the roof.  It sat quietly picking apart prey and then started to squawk a bit.  This is yet another new perch location and an unexpected find!