Uncommon Birds in Delaware
Our list for Delaware has 81 uncommon birds recorded regularly there: 5 residents, 15 summer visitors, 29 winter visitors, 30 passage migrants and 2 scarce visitors
Most likely in October
GBIF · OctShare of all bird records in Delaware in October, 2019–2024. Each month links to that month’s page.
All 81, most common first
Peregrine FalconFalco peregrinusWinter visitorUncommon34–58 cmRegularly Jul–May
Ruddy TurnstoneArenaria interpresResidentUncommon21–24 cmRecorded all year
Scarlet TanagerPiranga olivaceaSummer visitorUncommon16–19 cmRegularly Apr–Oct
Yellow-bellied SapsuckerSphyrapicus variusWinter visitorUncommon19–22 cmRegularly Sep–Apr
Sand MartinRiparia ripariaSummer visitorUncommon12–14 cmRegularly May–Sep
Pied-billed GrebePodilymbus podicepsWinter visitorUncommon31–38 cmRecorded all year
Lesser Black-backed GullLarus fuscusWinter visitorUncommon52–64 cmRecorded all year
MerlinFalco columbariusWinter visitorUncommon24–33 cmRegularly Sep–May
Blackpoll WarblerSetophaga striataPassage migrantUncommon13–15 cmRegularly May–Oct
Chestnut-sided WarblerSetophaga pensylvanicaPassage migrantUncommon10–14 cmRegularly May–Oct
RazorbillAlca tordaWinter visitorUncommon38–43 cmRegularly Dec–Mar
Horned LarkEremophila alpestrisWinter visitorUncommon16–20 cmRecorded all year
Brent GooseBranta berniclaWinter visitorUncommon55–66 cmRegularly Oct–May
Great CormorantPhalacrocorax carboWinter visitorUncommon80–100 cmRegularly Oct–Mar
BobolinkDolichonyx oryzivorusPassage migrantUncommon16–20 cmRegularly May–Oct
Fox SparrowPasserella iliacaWinter visitorUncommon15–19 cmRegularly Nov–Mar
Pine SiskinSpinus pinusWinter visitorUncommon11–14 cmRegularly Oct–May
Black-throated Green WarblerSetophaga virensPassage migrantUncommon11–12 cmRegularly Apr–Oct
Horned GrebePodiceps auritusWinter visitorUncommon31–38 cmRegularly Nov–Apr
Purple SandpiperCalidris maritimaWinter visitorUncommon20–22 cmRegularly Nov–Mar
Common TernSterna hirundoSummer visitorUncommon31–35 cmRegularly May–Nov
Western SandpiperCalidris mauriPassage migrantUncommon14–17 cmRegularly Jul–Jan
EiderSomateria mollissimaWinter visitorUncommon50–71 cmRegularly Nov–Mar
Data: EOD – eBird Observation Dataset (Cornell Lab of Ornithology), accessed via GBIF.org, CC BY 4.0. Records from 2019–2024, aggregated and filtered by Birdfact. How these lists are made