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Elsen's Hill, West DuPage Woods Forest Preserve
Illustrated Checklist
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Native and Naturalized (220)
Hybrids (2)
- Golden-winged x Blue-winged Warbler (hybrid) Vermivora chrysoptera x cyanopteraLast observed by Matt Zuro on 3 Sep 2022
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Luke Dahlberg on 5 May 2018
Additional Taxa (37)
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Vera Miller on 22 May 2022
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Sandeep Biswas on 12 Mar 2024
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Aubrey Sirman on 9 Sep 2023
- Philadelphia/Red-eyed Vireo Vireo philadelphicus/olivaceusLast observed by Hazem Alkhan on 15 May 2021
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Steve Aram on 27 Apr 2022
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by Jack Kelly on 15 Oct 1990
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by Sean Redman on 13 May 2022