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Irwin Prairie State Nature Preserve
Illustrated Checklist
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Native and Naturalized (206)
Hybrids (1)
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Jim Parker on 18 May 1999
Additional Taxa (22)
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Alex C on 28 May 2019
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Dave Rodriguez on 24 Jul 2022