Jay took more pictures at the birdfeeder in the yard. Included is the Asian koel (called Koha in Sri Lanka.) They have a common, well-known, loud call. Unlike some species, the females are artfully marked; whereas, the males are completely black.
Sri Lankans associate the call of this bird with Sinhalese and Tamil New Year, in April. The koha might be noisier during the spring but, of course, these birds make noise year-round.