It doesn’t take a rocket scientist to figure this one out. Here’s what’s happening weather-wise in the Southwest:
Here’s the range map for Cassin’s Sparrow:
Does it not make sense that birds trying to make a go of breeding season in the Southwest would be dispersing from that area in search of literally greener pastures? I might have said so, given the window-killed Cassin’s Sparrow I found well east of its normal range on May 23rd. Given the two singing males found here in Stillwater over the weekend, I’m now pretty well convinced that this is no fluke. It’s time to make predictions about short-term distributions in response to the western drought, and see what other species may be fleeing that region for better territories.