Greg Gard caught the raptor show on Disposal Road last weekend, which included Northern Harriers, Red-tails, and (here's the teaser) either a Merlin or an immature Peregrine Falcon (above). What do you think?
(Thanks Greg!) A few more shots follow, including the mystery falcon and a Northern Harrier.
Immature Peregrine
Deedeeburnside nails it.
Agreed, immature Peregrine. A Merlin would have a couple wide black/thin white tail bands; young Peregrines have multiple thin bands on a brownish/tan tail.
I also saw this bird on Sunday perched on the towers occasionally taking a dive towards a Mallard or Shoveller. I hope that it was eventually successful, but it was hard to watch. I also agree that it was a peregrine due to the behavior.