one sparrow resting in city park in berlin, representing urban wildlife. one small bird is perched on a metal garden fence

sparrow bird flock one solo passeridae passer fence garden park nature wildlife berlin urban habitat small perch resting environment closeup wild birdwatching fauna feather avian city ecosystem meadow life adaptation hungry ornithology animal family urbanization species resilience germany nesting survival foraging scarcity challenge conservation population noise struggle biodiversity balance problem