Birdsong : Marsh warbler [12 JUN 2021]

Singing marsh warbler (Acrocephalus palustris), early morning (around sunrise).
Video is unprocessed. Audio has been filtered slightly to reduce distant traffic rumble.
Date and approximate time of each clip can be seen via the clip name, bottom-left of each shot. This is in the format yyyymmdd_hhmmss . . . with the "_iXs" indicating that all the footage was shot on Apple iPhone Xs, phonescoping through an Opticron field scope.