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Motacilla flava ssp.
These are all probably female Yellow Wagtails, (or possibly last years juveniles) but there are several sub-species which regularly migrate through Spain. Males identified in this huge flock were Blue-headed (M.f. flava) and Black-headed (M.f. feldegg) so some are likely these. Spanish (M.f. iberica) have also been seen here on migration and there may have been some but not in any of the photographs I took. Juveniles and females of the various sub-species are considered by some to be impossible to separate with any certainty in the field. Males are relatively easy, having distinct head and throat patterns.
Agricultural fields by coastal marshes
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