eurasian oystercatchers - haematopus ostralegus, on a gloucestershire wetland.

adult animal aves avian avifauna beak bill bird birding birdwatching black england estuary eurasian fauna gloucestershire haematopus legs nest orange ornithology ostralegus oystercatcher oystercatchers plumage shorebird site slimbridge spring summer wader water waterbird wetland white wild wildlife wwt