Migration & timing
Common Merganser in Colorado
There aren't yet enough observations of Common Merganser in Colorado to describe its timing with confidence.
Sighting 12 observations in Colorado
Check back as more observations come in, or explore Common Merganser across North America.
Common Merganser elsewhere
More birds in Colorado
Data: iNaturalist research-grade observations (CC0 / CC-BY), via GBIF. Excludes eBird.