09-06-13 Field Note

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09-06-13 Field Note

September 6, 2013

Kate Stone and the Avian Science Center provide insight into birds congregating at the northern center pivot, songbird shrubby draw surveys, and fall migration banding.

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Kate Stone Field Note 09-06-13

Vesper Sparrows continue to dominate the shrubby draw surveys. We detected high numbers of seed-eating species like the Pine Siskin, American Goldfinch, and Clark’s Nutcracker.

Birds detected in shrubby draw surveys 8/19/2013 and 8/27/2013

590 This time of year, many sparrows are difficult to identify. This is especially true for juveniles from the genus Spizella. Sometimes birds issue distinctive call notes, but often the sparrows remain silent. I recorded both of these birds as “Unidentified Sparrow”.

Sparrow”. This water leak, outside of the large exclosure in the northern center pivot field, attracted huge flocks of birds. Visitors included sparrows and a Yellow-rumped Warbler.

Sparrows line up on the exclosure fence between ground foraging and drinking water from the leak.

leak. A pair of Yellow-rumped Warblers rest on a plant exclosure.

exclosure. A Merlin peers down at a flock of Cedar Waxwings congregating on the northern floodplain.

Avian Science Center: Fall Migration Banding The floodplain banding site continued to capture the most birds, due mostly to the presence of large flocks of Cedar Waxwings. Numbers also increased at the higher elevation sites. The capture of 28 species across all three sites suggests migration is in full swing. In the next few weeks, we expect to see warbler numbers decrease as sparrow numbers increase. Each banding site will be fully operational all three days next week.

This hatch-year Northern Waterthrush was caught at the floodplain site.

misaligned. A side-by-side comparison of Dusky Flycatcher (left) and Hammond’s Flycatcher (right). These birds are difficult to distinguish from one another except by vocalization.

Previous Field Note

08-26-13 Bird Field Note