Ducks, Geese & Swans in Colorado
Our list for Colorado has 28 ducks, geese & swans recorded regularly there: 3 residents, 2 summer visitors, 20 winter visitors and 3 passage migrants
Most likely in October
GBIF · Oct
Share of all bird records in Colorado in October, 2019–2024. Each month links to that month’s page.
All 28, most common first
Eurasian WigeonMareca penelopePassage migrantRare42–51 cmRegularly Dec–Apr
Greylag GooseAnser anserWinter visitorRare75–90 cmRecorded all year
Mute SwanCygnus olorWinter visitorRare140–160 cmRecorded all year
Swan GooseAnser cygnoidesWinter visitorRare81–94 cmRecorded all year
Muscovy DuckCairina moschataSummer visitorRare66–84 cmRegularly Jan–Nov
Smallest to largest
Length, cm- Eurasian Teal 34–38 cm
- Ruddy Duck 35–43 cm
- Cinnamon Teal 36–43 cm
- Hooded Merganser 40–49 cm
- Goldeneye 40–51 cm
- Eurasian Wigeon 42–51 cm
- Northern Shoveler 44–51 cm
- Greater Scaup 39–56 cm
- Long-tailed Duck 37–60 cm
- Wood Duck 47–54 cm
- Gadwall 46–56 cm
- Surf Scoter 48–60 cm
- Red-breasted Merganser 52–58 cm
- Mallard 50–65 cm
- Brent Goose 55–66 cm
- Ross's Goose 57–64 cm
- Common Merganser 58–68 cm
- Cackling Goose 53–76 cm
- Northern Pintail 59–76 cm
- Greater White-fronted Goose 64–81 cm
- Muscovy Duck 66–84 cm
- Snow Goose 69–84 cm
- Greylag Goose 75–90 cm
- Swan Goose 81–94 cm
- Canada Goose 76–110 cm
- Tundra Swan 120–150 cm
- Trumpeter Swan 139–157 cm
- Mute Swan 140–160 cm
Body length, bill to tail. Rare birds in grey.
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