sentences:  This list's taxonomic treatment (designation and sequence of orders, families and species) and nomenclature (English and scientific names) are those of "The Clements Checklist of Birds of the World", 2019 edition.The designations as accidental, introduced, and extirpated, and the notes of worldwide population status such as "critically endangered", are from "Bird Checklists of the World".The notes of status in Thailand, such as "winter visitor", are from Lekagul and Round (1991).