File:Cossypha humeralis, dagbreek-repertoire, Waterberg Natuurpraal, a.mp3

Cossypha_humeralis,_dagbreek-repertoire,_Waterberg_Natuurpraal,_a.mp3(MP3 audio file, length 12 min 26 s, 192 kbps overall, file size: 17.07 MB)

Captions

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Morning song of a White-throated robin-chat

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Description
Afrikaans: 'n Witkeeljanfrederik sing met dagbreek vir sowat 'n kwartier aaneen (12:25 klankgreep ingesluit) uit dieselde setel, 'n boomtak sowat 3-4 meter hoog in 'n oop boomkruin van 'n bosgroepie te Waterberg-plato, Limpopo. 'n Tweede van die spesie blyk net binne hoorafstand te antwoord (vanaf 2:40, regdeur). In die verloop van 'n kwartier word meer as 'n honderd afgemete frases geuiter, sowat een frase elke 6 sekondes. Enkele ander voëlspesies is op die agtergrond hoorbaar, waaronder Geelborswillie (0:25, 0:36, 0:44, ...), Blousysie (1:40), Klipstreepkoppie (1:43), Swartkopwielewaal (1:05), Gestreepte wipstert (6:50), Tortelduif (7:13), Europese byvreters (8:30), Grootringduif (12:20) en ander, benewens onbeplande geruis weens my verstelling aan die apparaat.
English: Morning repertoire of a White-throated robin-chat, which delivers its song for some 15 minutes (12:25 included here) from the same perch in the upper branches of a bush clump with dense understory thicket, to which it could retreat for safety. It sings from 3-4 metres up in the open tree canopy, where it warms itself in the first rays of the morning sun. A second conspecific appears to answer from 2:40, right through, just within hearing distance. The original recording contains 138 phrases (the last 122 included in this clip), starting at 07:36 am and continuing for just over 14 minutes, i.e. a song phrase every 6 seconds. The sound graph suggests that the song is most vigorous soon after it starts, when perhaps the assumed male is most concerned with reestablishing his territory, and least vigorous in the last minute or so, when the sun is getting bright and other bird species noisier.

The recording was made late summer, and a northward migrating flock of European bee-eaters is audible from 8:30 in the clip, as they leave their night roost in a nearby tall Eucalypt. Additional background sounds are from Yellow-bellied greenbul (from 0:25), Black-headed oriole (1:10), Blue waxbill (1:40), Rock bunting (2:40), White-browed scrub robin (6:50), Cape turtle dove (from 7:13), Red-eyed dove (12:20) and Orange-breasted bushshrike, besides various scratching sounds when adjusting the recorder's cover, unfortunately.

The recording is from the centre of the Waterberg plateau, which is also at the centre of the species' range. A follow-up visit to the location at the start of June 2023 revealed no such morning repertoire at all, nor any perching at the top of trees. The song was replaced by less striking contact notes from the midst of thickets. This seems to be at odds with the Cape robin-chat, for instance, which sings vigorously at any time of the year.
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Source Own work
Author JMK

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Date/TimeThumbnailDimensionsUserComment
current14:58, 9 September 202112 min 26 s (17.07 MB)JMK (talk | contribs)Uploaded own work with UploadWizard

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Format Bitrate Download Status Encode time
Ogg Vorbis 104 kbps Completed 14:58, 9 September 2021 22 s

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