1) Animal communication 2) Avian serenade 3) BBC television drama 4) Birdcall 5) British radio drama 6) Call 7) Call from a cage 8) Call of the wild 9) English surname 10) It may be heard in an aviary 11) Play about World War I 12) Rustic serenade 13) The dawn chorus Found on https://www.crosswordclues.com/clue/birdsong
[digital radio channel] Birdsong was a temporary radio channel which used to broadcast on national digital radio in the United Kingdom. The transmission consisted of a continuously looping recording of bird song. It was available via the Digital One DAB network. The recording is also available via the Digital One website until Autumn 2009 a... Found on http://en.wikipedia.org/wiki/Birdsong_(digital_radio_channel)
certain vocalizations of birds, characteristic of males during the breeding season, for the attraction of a mate and for territorial defense. Songs ... [14 related articles] Found on http://www.britannica.com/eb/a-z/b/68