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Saturday, 2 May 2015

All Change

A couple of months ago on a regular site that I monitor, I noticed that the resident Tiercel had changed behaviour, resting points and indeed hunting procedures/activities.

What really bought it to my attention was witnessing the Tiercel tenaciously chasing a Kingfisher on March 9th (see earlier post), at the time I remember thinking he looks small and why the Merlin like pursuit. The usual Tiercel would after 2 or 3 passes  on prey, give up.

The regular Tiercel was ringed from Chichester, had been present since 2004, eventually I was indeed able to confirm that we had a new smaller unringed Tiercel from CCTV.I monitored and watched him, he did not appear territorial and there seemed to be no sign of the Falcon.

I visited the site often, still no sign of the Falcon, not seen visually and additionally Crows were taking the P landing on the building with the new Tiercel basically ignoring them. Peregrines if breeding or even Tiercels on territory will not usually tolerate Crows on the nest structure or building, especially if paired.

My mind as always, given the treatment and persecution that they receive in other parts of the Country was suspicious, for one to be replaced, likely a natural occurrence, but a pair possibly around the same time is bloody odd to say the least.
However it is possible for these things to happen, you can never prove it and to all intents and purposes it could be a ‘ natural ‘ occurrence, the Falcon has gone missing before but admittedly never this close to breeding.

With my suspicious mind running riot I continued monitoring, only ever seeing the little Tiercel, both adults had seemingly gone after a good number of years, both in the space of a couple of months, what would you think?

Peregrines, as per there Latin name do wander far and wide, this pair are no different, I know they have a decent sized territory, could they have come to grief further afield, lots of questions but I suspect I will never know.

On April 12th having given up on the year and the little Tiercel getting a mate, lo and behold a Falcon appeared in the nest box with him. What was more, it was not the regular Falcon, she had definitely gone, this new Falcon was paler, different head and malar stripe markings along with mantle difference.

2014 Falcon

2015 - new Falcon 

Regular Peregrine watchers and addicts like myself will know that London’s egg laying starts around March 10th and are all usually laid by the start of April – was it too late?

Had I missed seeing this Falcon, how long had she been present, was she a fresh arrival?

Lots of questions and I suspect she was a fresh arrival, I and others were monitoring that camera a lot and the first sight of her was April 12th, added to this, the Tiercel although present was letting Crows land on the building beforehand.

The question now was, will they breed – yes by April 19th she was incubating so good news all round, the new had replaced the old, the natural order of things or foul play, like I said I suspect I will never know.


  1. Good stuff Dave and hopefully a happy ending :-)

  2. Alan thanks, will put updates on the blog, it is sad but hopefully it is just nature and nothing more sinister.