Black-throated Thrush Turdus atrogularis – Birds in Flight

>> GENERAL >>>>>

– medium-sized passerine, roughly size of Common Blackbird
– vagrant in most parts of WP
– nocturnal migrant, local diurnal movements
– in Asia migrates singly or in small flocks

>> VISUAL ID >>>>>

Black-throated Thrush Turdus atrogularis, M
BIF1916, 15/02/2017, Phobjika, Buthan, Mathias Putze

>> ACOUSTIC ID >>>>>

– very vocal
– utters different calls in flight
– on long distance flights most typical a short two-voiced whistle, 0,2s in length
– distinct shape in spectrogram: a narrow upper, and parallel, a broader modulated lower band
– 1st partial dominant frequency band between 3,1 and 3,9kHz
– the 2nd partial usually the ‘loudest’
– inharmonic partials
– very similar to Red-throated Thrush but the lower band is much broader modulated

– overview –

– detail –

Black-throated Thrush Turdus atrogularis, call in flight
BIF3131, 11/11/2019, Nisil, Azerbaijan, Georg Rüppel
– several birds compiled

– overview –

– detail –

Black-throated Thrush Turdus atrogularis, call in flight
BIF3132, 17/11/2019, Nisil, Azerbaijan, Georg Rüppel

>> COMPARISON SPECIES >>>>>

Red-throated Thrush (v) (a)

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