birds bond circle commune crow Crows flock flock of birds friends gathering group hierarchy krayker meeting nature roost silhouette silhouette of birds social together bird Incredible India tree air atmosphere blue cirrus cloud cloud formation clouds cumulus meteorology rain skies sky soft stratus swarm of birds water weather wheather white abstract BIRD FLOCK graphic green tree branch tree root bunch India Kentish Plovers migratory birds plover Shorebirds animal animals down farm farming gander geese goose gooses gosling goslings grass liver quill danger evening flight