Drone flight over estuary as flock of Caspian Terns takes off sandbank

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