These are the hoarse calls of the Red-bearded Bee-eater (Nyctyornis amictus). Often described as “kar kar kah kah ka”, but with much variation (Wells 1999). HBW (2019) says “A fast, descending series of 5–10 hoarse notes….” My recording had 11 notes in 35 seconds and 12 in 45 seconds. Each note was 0.75-1 second long and look like sail-shaped structures on the sonogram. Call recording here: https://www.xeno-canto.org/514735
Amar-Singh HSS (Dato’ Dr) – Ipoh, Perak, Malaysia
Habitat: Forest reserve
Date: 9th August 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