Black-throated Diver (Gavia arctica)Distribution and seasonality in the UK
Winter visitor · reporting peaks December · Loons · BOU category AF
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.
Black-throated Diver has been recorded in 531 of the 2,971 10 km squares covering UK land (18%) in records to 2026. Winter visitor in the UK. Its strongest squares are in Scotland, England and Wales. Reporting peaks in December.
This species is protected under Schedule 1 of the Wildlife and Countryside Act 1981. It is an offence to disturb it at or near the nest without a licence. Breeding-season distribution is not shown and square-level counts are withheld.
- Very high
- 13% or more of visits
- High
- 3% to 13%
- Moderate
- <1% to 3%
- Low
- under <1%
- Surveyed, not recorded
- at least 20 qualifying visits, no record
- Insufficient records
- too few visits to say
- Not shown in the breeding season
- sensitive breeding species
- Lighter fill
- Few visits, lower confidence
- Small dot
- Occasional: a single record, or out of season
Seasonality
| Month | Relative to peak | Share of visits | Typical class |
|---|---|---|---|
| January | 73% | <1% | Moderate |
| February | 48% | <1% | Very high |
| March | 28% | <1% | Very high |
| April | 15% | <1% | Insufficient records |
| May | 7% | <1% | Insufficient records |
| June | 0% | <1% | Insufficient records |
| July | 0% | <1% | Insufficient records |
| August | 1% | <1% | Insufficient records |
| September | 19% | <1% | Very high |
| October | 34% | <1% | Very high |
| November | 75% | <1% | Very high |
| December | 100% | <1% | Very high |