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Hanscom AFB--Virginia Rd.
Illustrated Checklist
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Native and Naturalized (158)
Hybrids (1)
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Bird Observer Data on 17 Jun 1997
Additional Taxa (18)
- Lesser/Greater Yellowlegs Tringa flavipes/melanoleucaLast observed by Carter Winstanley on 14 Nov 2020
- Great/Double-crested Cormorant Phalacrocorax carbo/Nannopterum auritumLast observed by David Swain on 10 Oct 2020
- Downy/Hairy Woodpecker Dryobates pubescens/villosusLast observed by Carter Winstanley on 15 Feb 2020
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by David Swain on 15 Aug 2021