At the site where I am licensed to photograph Peregrines I have, this last two weeks or so been joined by a pair of Kestrels.  Yesterday their breeding activities were really ramped up with both birds on the their chosen nest ledge – an old discussed Raven's nest.  I watched the female shaping a scrape with her body, in much the same way as the peregrines do and then I observed the male displaying to his mate on the ledge. Then both birds were in an adjacent tree and I was hoping that they would copulate. I have been informed that there will be no conflict between the resident Peregrines but this will be an interesting liaison.  The male Kestrel is a feisty bird and I have seen him on several occasions mobbing, or flying at the female Peregrine. He may have a death wish!  It will be fascinating if both nests are successful, can you imagine if there are juvenile Kestrels and juvenile Peregrines in the territory together?  Well, in fact I am informed by raptor experts that this will not be unusual and there are records of Peregrin adults actually feeding juvenile Kestrels in confusion. Instinct is a great thing and I doubt that the Peregrines can resist the begging calls of the closely related falcon species. Unfortunately the distance from my hide to the nest ledge is quite a big one so the photos are the best I can do.  This is the female Kestrel flying from the ledge

Then we have the male and female on the ledge, male in the front he is a young bird and still has a barred tail.

In this one they are displaying to each other, when they do this they call loudly and also continue calling in flight.

In this one the female is on the left.  The male has a very peculiar display dance where he bends his knees and bobs up and down.