Also interesting: https://gizmodo.com/a-viral-new-bird-song-in-canada-is-causing-sparrows-t-1844245103 https://gizmodo.com/a-viral-new-bird-song-in-canada-is-ca

Also interesting: https://gizmodo.com/a-viral-new-bird-song-in-canada-is-causing-sparrows-t-1844245103 https://gizmodo.com/a-viral-new-bird-song-in-canada-is-causi... White-throated sparrows across Canada are rapidly replacing their classic three-note song ending with a new two-note version, which originated in British Columbia and has spread eastward over the past two decades.