Average number of individuals by week based on Singapore Bird Database data, Jul 2012 to Jun 2022 (
Nov 05-Nov 11
01 Nov 2021
25 Apr 2020
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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.