These are from call recordings of the Ruby-cheeked Sunbird (Chalcoparia singalensis singalensismade). The sunbird was a self-feeding, immature male I posted from 17th August 2020. Different sources have described song and calls in different ways with trills, chirps and a variety of other notes. I have heard much variation in the calls and songs. Some sonograms and waveforms of calls:
The above shows one variety of call use. These notes have some similarity in the sonogram but are used in a variety of different ways. The first section shows single notes, 0.2 seconds long. These can be used as coupled notes (2-5 notes) in a run (second section). Finally the same call can be extended (up to 0.4 seconds) to give a longer drawn-out call or slurred note.
The above shows a group of sharper, briefer (0.1 seconds), higher frequency calls that are often used in runs of 3-6 notes.
All these calls can be heard in this recording: https://www.xeno-canto.org/593119
Amar-Singh HSS (Dato’ Dr) – Ipoh, Perak, Malaysia
Location: Kledang-Sayong Forest Reserve, Ipoh, Perak, Malaysia
Habitat: Trail along primary jungle
Date: 17th August 2020
Equipment: Equipment: Nikon D500 SLR with Nikon AF-S Nikkor 500mm f/5.6E PF ED VR, handheld with Rode VideoMic Pro Plus Shotgun Microphone