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Olmsted
Illustrated Checklist
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Native and Naturalized (296)
Exotic: Provisional (1)
Exotic: Escapee (5)
Hybrids (5)
- Snow x Ross's Goose (hybrid) Anser caerulescens x rossiiLast observed by Lance Vrieze on 9 Mar 2016
- Graylag x Canada Goose (hybrid) Anser anser x Branta canadensisLast observed by Todd Mitchell on 19 Jun 2021
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Nolan Kerr on 26 Feb 2024
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by jerry pruett on 1 Sep 2020
- Lawrence's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F2 backcross)Last observed by Jeffrey Bailey on 5 Jun 2023
Additional Taxa (64)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Sandy Hokanson on 18 Apr 2023
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by Michael Degerstrom on 8 Mar 2024
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Marie Adams on 1 Jun 2022
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Joel Dunnette on 5 Oct 2023
- Double-crested/Neotropic Cormorant Nannopterum auritum/brasilianumLast observed by Luke Hollander on 23 Apr 2023
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Michael Degerstrom on 4 Sep 2023
- Philadelphia/Warbling Vireo Vireo philadelphicus/gilvusLast observed by Joel Dunnette on 13 May 2023
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Minard Petersen on 6 May 2023
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by Tate Putman on 2 Oct 2022
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by Jim Peterson on 12 May 2020
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by Lance Vrieze on 18 Sep 2020