Ardea cinerea Grey Heron Herons Ardeidae GRHE ARDCIN North Rhine-Westphalia Germany August summer (Ardea cinerea) in a threathening posture threaten threatens bird birds species animal animals Europe Graureiher Reiher Vogel Vögel Vogelart Vogelarten Tier Tiere Sommer Nordrhein-Westfalen Deutschland Drohhaltung droht drohen drohend