Hi all
I wonder if answer is as simple (of complex) as maybe migrating birds simply not stopping in Colorado, drought, loss of habitat in Colorado, taking different paths, weather challenges, lack of food sources, other???
Also, a study (2019) released in the journal Nature Climate Change suggests "that rising temperatures are causing birds to migrate a little earlier each spring. It finds that the journey home is shifting forward by a little less than two days each decade. The researchers, led by Kyle Horton of Colorado State University, analyzed millions of radar scans collected between 1995 and 2018. They used a high-tech method to differentiate between migrating birds and weather systems—a special type of artificial intelligence known as a neural network. Neural networks rely on complex sets of algorithms and can be trained to recognize patterns in data."
Sort of suggests we should be seeing migrating birds earlier than anticipated.
On Thursday, April 29, 2021 at 11:48:33 AM UTC-6 Steve wrote:
Hey COBirders,No big news for Clear Spring Ranch banding today, except that among the very few birds banded today was my FOY Common Yellowthroat, Ad Male. This is not rare, but what is unusual is that this is by far the latest for my FOY at CSR. I usually catch them starting Day One, around 4/20. Migration is delayed here, for whatever reason.So far in a week I've banded 60 birds, 1/2 of which are White-crowned Sparrows that winter here and will be leaving soon. 3 Ruby-crowned Kinglets, 1 Audubon's Warbler, 1 Wilson's Warbler, 10 Lincoln's Sparrows.1 House Wren. Pretty slow to date.A cool sighting for me, though, was a large flock of American Pipits (50+) all over a hayfield that was freshly disked yesterday. And I think one was a victim of the resident Am Kestrel, as one was feeding on the ground out there, and nothing else was in the field except Mourning Doves.On the way out, the 20 White-faced Ibis and 2 Long-billed Curlew were present by the entrance road. That's cool.Steve BrownColo Spgs
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