animal animals ardea bird birds black-headed borsele borssele chroicocephalus cinerea cooling crabs crustaceans drain-pipe drainage drainpipe egrets egretta fauna feed feeding fish fishes fishing flock food garzetta grey group groups gulls herons little marine nature netherlands nourishment nourishments nuclear nutrition outfall outlet-pipe pipe pipes plant plants power ridibundus sea seagull seagulls shorebirds station urban wader waders wading wait waiting waste waste-pipe water wildlife zeeland