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The UK Bird Atlas

Ferruginous Duck (Aythya nyroca)Where and when to see it in the UK

Winter visitor · reporting peaks November · Ducks, Swans, and Geese · BOU category AE

Records to 2026-08-16 · build 2026-08-31

Ferruginous Duck (Aythya nyroca)
Frank Vassen from Brussels, Belgium, CC BY 2.0, via Wikimedia Commons
Peak months
Ferruginous Duck: relative reporting rate by 10 km square, September

Contains OS data © Crown copyright and database right 2026 (grid squares, place names from OS Open Names). Northern Ireland place names: OSNI Open Data, OGL v3.0. County and country boundaries: Office for National Statistics, Open Government Licence v3.0. Coastline: Natural Earth. Bird records from the data partners listed here.

Ferruginous Duck has been recorded in 127 of the 2,971 10 km squares covering UK land (4%) in records to 2026. Winter visitor in the UK. Its strongest squares are in England, Wales and Scotland. Reporting peaks in November.

Conservation status: Near Threatened (IUCN Red List, NT)
View on the IUCN Red List
Relative to this species' best squares (how classes are calculated)
Very high
49% or more of visits
High
3% to 49%
Moderate
<1% to 3%
Low
under <1%
Surveyed, not recorded
at least 20 qualifying visits, no record
Insufficient records
too few visits to say
Lighter fill
Few visits, lower confidence
Small dot
Occasional: a single record, or out of season

Seasonality

Reporting rate by month, relative to the peak month
MonthRelative to peakShare of visitsTypical class
January 79%<1%Moderate
February 67%<1%Moderate
March 25%<1%Very high
April 28%<1%Low
May 27%<1%Moderate
June 9%<1%Moderate
July 14%<1%Very high
August 12%<1%Very high
September 26%<1%Low
October 24%<1%Low
November 100%<1%High
December 82%<1%High

Squares with the highest reporting rate in November

SquareWhereShare of visitsClass
SD53Lancashire, England100%Very high
SK55Nottinghamshire, England100%Very high
SO12Powys, Wales100%Very high
ST55Somerset, England100%Very high
ST56North Somerset, England100%Very high
SY58Dorset, England100%Very high
TL87Suffolk, England100%Very high
TQ58Havering, England100%Very high
J14Armagh City, Banbridge and Craigavon, Northern Ireland67%Very high
TG41Norfolk, England18%High

Spotted an error in a square? Report it and it goes into the review queue. Read the methodology for how classes, flags and sensitive-species rules work. Data to 2026.