Lately, David Sibley has been talking a lot about first impressions. Normally, I find my impression to be accurate. Occasionally I’ll think I’m wrong, study for awhile, and then end up back with my first thought. But occasionally you end up way, way off.
Sunday was a great example. I was leading a Menotomy walk at the Waltham St. Fields. Working the edge of the field was pretty slow, a few decent birds but they weren’t cooperative. We were working our way to the fields beyond the creek, when Karsten Hartel spotted a slightly larger bird perched at the top of a stalk of corn. He got a scope on it, and in poor light, we both blurted out Dickcissel.
We moved over a few feet to get it in better light and noticed that it seemed rather dark for a Dickcissel. Nothing else sprang to mind though. I snapped a few pictures and everyone started pulling out field guides. Obviously not a Dickcissel. Cowbirds looked somewhat close, but that just seemed wrong.
We watched a little more and couldn’t see anything to say it wasn’t a cowbird. The bill seemed a bit longer, so we considered Shiny, but dismissed it. It still didn’t feel right for Brown-headed, so we spent a good bit of time looking after it flew.
And then I got home and downloaded the pictures:
Suddenly it looks exactly like a Brown-headed Cowbird. Note that the upper mandible appears to be overgrown slightly and crosses, which throws the shape off slightly. At least the rest of the trip turned out well, lots of good looks at some nice birds