This morning Tim and I counted at Tiscornia as part of an organized lakewatch. There was a steady movement of blue-winged teal, we probably had 500-600 or so, mostly well out. The best bird was a merlin which Tim picked up harrying a passerine well out over the lake. Despite multiple passes the smaller bird evaded capture by dodging sideways and gaining altitude. The altitude gain was key, exhausted birds that just beeline for the shore with only lateral movement seem to get snagged. Eventually the merlin either gave up or lost it and flew straight in, perching up in the snags more commonly occupied by peregrines. Ironically the passerine (Tim thought a Tennessee warbler) flew over our heads as well and could have been re-targeted by the raptor which had easily beaten it to shore. The merlin's wings seemed fairly uniformly colored without any retained faded old feathers so it was probably a first fall bird.
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Here's a little better detail from a female bird in Washtenaw, I'm guessing about February of 2005 or 2006.
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