Date: 5/15/19 10:12 am From: Matt Brady <podoces...> [Mendobirds] <Mendobirds-noreply...> Subject: [Mendobirds] Re: Recent White-crowned Sparrow report
Hi Feather, Mendocino County has two eBird filters: one for the immediate coast and one for the inland county. This is why things like Black Oystercatcher, Western Gull, and Brandt's Cormorant do not appear on the filter when you start a checklist for a Ukiah birding spot. I'm not sure where the exact boundary is, but the coastal filter is pretty narrow, and this checklist (https://ebird.org/view/checklist/S56238383) happened to fall in the Inland filter. White-crowned Sparrows (subspecies 'nuttalli') breed in a very narrow strip of coastal sage and chaparral along the immediate coast, but are unusual even a mile inland during the late spring and summer breeding season. So while White-crowns are expected along the coast, this report is actually a little bit notable!
If you look at the eBird map for June and July ( https://ebird.org/map/whcspa?neg=true&env.minX=&env.minY=&env.maxX=&env.maxY=&zh=false&gp=false&ev=Z&mr=6-7&bmo=6&emo=7&yr=all&byr=1900&eyr=2019) you'll notice that the vast majority of records fall within a mile or so of the coast, but there are a handful of inland records in the county. Most of them are undocumented, unfortunately, so it's hard to tell if they were late or early migrants or entered in error. You'll also notice that there are quite a few records from the coast range farther north, in Humboldt County. A different subspecies, the 'pugetensis' subspecies, breeds there, but it doesn't make it into the mountains of northern Mendocino County. A third subspecies, 'oriantha' breeds in the Sierra Nevada.
Matt Brady Baton Rouge LA (but formerly Potter Valley)