Sentence:  The adult male koels (or <WSD>kohas</WSD> as they are locally known) start calling in March, and are in full voice come April. Most Sri Lankans associate the call—a shrieking 'koo-Ooo' or 'ko-Haa' more penetrating than the mellifluous European cuckoo—with the start of a new year, as both the Sinhalese and the Tamils celebrate this in the middle of that month. 
Meaning of the word marked with <WSD> tags:  (bird) The koel ("Eudynamys"), a genus of cuckoos from Asia, Australia, and the Pacific with a distinctive loud call; specifically, the Asian koel ("Eudynamys scolopaceus").