Gull-billed Tern Gelochelidon nilotica
Average number of individuals by week based on Singapore Bird Database data, Jul 2012 to Jun 2022 (all records)
Peak week Sep 17-Sep 23
Early date 08 Sep 2021
Late date 30 Jun 2019
Mid-September appears to be the peak time for this rare visitor. This is usually the period when a few are seen in coastal locations, mainly in the north of Singapore.