We finished up our banding season at Chatfield last week! We had to cancel our very last day of banding due to weather, but we were grateful that was the only cancellation of the season. In total we banded 643 birds over the course of our 22 banding days, with 50% of those birds being either Wilson's (225) and Yellow-rumped Warblers (111). We also had 94 same-season recaps and 45 returns from previous seasons. Our oldest recapture was a Yellow Warbler originally banded in 2022. We had 43 different species visit the banding station! (See table below)
We learned so much this season about what fall migration looks like at Chatfield. It was so interesting to see how the migration timing of different bird species varied. The Wilson's Warblers came through over the course of a month and peaked in mid September, for example, while the Yellow-rumped Warblers blasted through over the course of one week at the end of September. We also saw that the proportion of adult to young birds stayed fairly steady throughout the season, with about 40% being adults and 60% having hatched this summer. (See graphs below)
Thank you to all of you who were able to come visit us at the station and thank you to the wonderful staff and volunteers from both Bird Conservancy of the Rockies and Denver Audubon for helping the season run so smoothly. We had more than 500 visitors to the station!
New Birds Banded Species Total American Goldfinch 3 American Redstart 1 American Robin 2 Black-capped Chickadee 17 Blue-gray Gnatcatcher 6 Brown Creeper 1 Brewer's Sparrow 3 Bushtit 11 Cassin's Vireo 1 Chipping Sparrow 4 Common Yellowthroat 3 Downy Woodpecker 2 Dusky Flycatcher 2 Eastern Phoebe 3 Dark-eyed Junco (Gray-headed) 1 Dark-eyed Junco (Pink-sided) 1 Gray Catbird 16 Green-tailed Towhee 3 Hammond's Flycatcher 1 House Finch 8 Lesser Goldfinch 4 Lincoln's Sparrow 12 MacGillivray's Warbler 13 Northern House Wren 14 Northern Flicker 1 Northern Parula 1 Northern Waterthrush 2 Orange-crowned Warbler 67 Ovenbird 1 Ruby-crowned Kinglet 7 Red-eyed Vireo 1 Red-naped Sapsucker 1 Song Sparrow 24 Spotted Towhee 22 Swainson's Thrush 1 Traill's Flycatcher 4 Warbling Vireo 3 White-breasted Nuthatch 1 White-crowned Sparrow (Gambel's) 21 White-crowned Sparrow (Mountain) 6 Western Flycatcher 1 Western Wood-pewee 1 Wilson's Warbler 225 Yellow-breasted Chat 4 Yellow-rumped Warbler (Audubon's) 102 Yellow-rumped Warbler (Myrtle) 9 Yellow Warbler 6 Grand Total 643
[image: Warbler Species Migration Timing.png] [image: Timing by Age.png] Until next time,
Audrey Hicks Bander, Denver Audubon + Bird Conservancy of the Rockies
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