Slow drone pan over Olifants River Estuary, Caspian terns in flight

olifants river estuary caspian terns in flight wetlands south africa nature reserve stick together waterbirds terns coastal birds fly sandbank estuary conservancy avian flock wetland natures patterns vlei flock together flight aves birdwatching birds sand bar wildlife wild ornithology coast shore nature natural outdoors no people nobody aerial drone shot atlantic swift clear water patterns togetherness