While watching Yellow-bellied Prinias (Prinia flaviventris rafflesi) at close range, I also managed to do considerable recording of the ‘classical’ song from 3 adult male birds. Wells 2007 described this classical song or musical thrill as “tidli-idli-ul”. Handbook of Birds of the World (2019), on the song, says it lasts 0·7 seconds and “may be repeated after a few seconds and up to 20 times”. In recording, I counted 50 songs in a duration of 82 seconds i.e. one song every 1.64 seconds (95% CI: 0.99 to 2.29). They could continue singing past 20 times. Song duration was generally 0.7 seconds but this was not true for every bird. Some birds had songs that lasted up to 1.1 seconds. It all depends on the “introduction’ to the song which is often not heard well unless recorded. The bird will make a number of ‘clicking’ sounds before the thrill component is expressed. In most birds there are two clicks made; in some only a single click; in others 5-6 of these notes will be made lengthening the song (Note: Handbook of the Birds of the World says only one click).
Above shows the classical sonogram and waveform of a Yellow-bellied Prinia song with two up-spike clicks followed by the explosive thrill. A longer, edited audio recording of this type of song is here: https://soundcloud.com/amar-singh-hss/yellow-bellied-prinia-prinia-flaviventris-rafflesi-song
The second song (above) shows a bird that makes 5-6 clicks before the thrill, so much so that, at times, two songs can appear to be merged (above). A longer, edited audio recording of this 2nd type of song is here: https://soundcloud.com/amar-singh-hss/yellow-bellied-prinia-prinia-flaviventris-rafflesi-song2
Amar-Singh HSS (Dato’ Dr)
Ipoh, Perak, Malaysia
Location: Ipoh, Perak, Malaysia
Habitat: Secondary growth at fringe of city
Date: 1st February 2019
Equipment: Nikon D500 SLR with Tamron SP 150-600mm f/5-6.3 Di VC USD, handheld with Rode VideoMic Pro Plus Shotgun Microphone
