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The site was identified as internationally important for bird conservation in 2021 because it was regularly supporting significant populations of the species listed below, meeting IBA criteria.

Populations meeting IBA criteria ('key species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Tundra Swan Cygnus columbianus	LC	non-breeding (2017–2020)	278–282 individuals	B3a, C2

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2021. The most recent assessment (2010) is shown below.

State (condition of the key species' populations)
Species	Actual vs Reference (units)	% remaining	Result
Black Tern Chlidonias niger	0 / 5 (breeding pairs)	0	very unfavourable
Short-eared Owl Asio flammeus	0 / 1 (breeding pairs)	0	very unfavourable
Western Marsh-harrier Circus aeruginosus	1 / 1 (breeding pairs)	100	favourable
Montagu's Harrier Circus pygargus	2 / 6 (breeding pairs)	34	very unfavourable

Response (conservation actions taken for the key species and/or their habitats)
Designation	Planning	Action	Result
Not assessed	Not assessed	Not assessed	not assessed

Habitat	% of IBA	Habitat detail
Artificial/Terrestrial	70	Arable land; Forestry plantations
Grassland	30	Humid grasslands

Land use	% of IBA
agriculture	90
unknown	10

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Sønder Ådal (Denmark). Downloaded from https://datazone.birdlife.org/site/factsheet/sønder-ådal-iba-denmark on 14/01/2025.