a flock of crows flying over an open field during winter in deliblato, serbia. the image captures the movement of black birds

crows birds flying black field srbija serbian serbia winter flock sky nature wildlife migration deliblato bird landscape rural area open overcast natural habitat wild countryside scenery group avian flight atmospheric mood animal behavior pattern dark gathering environmental seasonal change overhead view watching ornithology cold season conditions serbia captures movement large takes expansive months silhouettes contrast sharply gray creating dramatic eerie atmosphere scene showcases gather migrate offering glimpse