Northern Boobook Ninox japonica
Average number of individuals by week based on Singapore Bird Database data, Jul 2012 to Jun 2022 (all records)
Peak week Nov 05-Nov 11
Early date 01 Nov 2021
Late date 25 Apr 2020
Peak migration for this species occurs in the first half of Nov, although it's occasionally sighted outside of this period. Teardrop-shaped underpart markings, compared to heart-shaped markings in Brown Boobook, are the main identification feature.