Thanks to the large areas of savannah, some moderately mature forest, and plenty of seacoast, you can expect to see a large variety of birds on Ko Sichang, particularly during the months from about November to April when many northern species migrate down for the warm winters. Egrets, bulbuls, terns, swiftlets, gulls, harriers and doves are all plentiful (There's also interesting non-bird wildlife: macaques, big monitor lizards, white squirrels, pythons...)

The photo above is of a nesting Indian Nightjar (Caprimulgus asiaticus). You can see it clearly enough here, but in the field we spent five minutes within three meters of the nest before we could relocate it, despite two previous visits.