Booted Warbler Iduna caligata
Average number of individuals by week based on Singapore Bird Database data, Jul 2012 to Jun 2022 (all records)
Peak week Jan 01-Jan 07, Jan 08-Jan 14, Jan 15-Jan 21 (12 more)
Early date 10 Dec 2017
Late date 23 Mar 2018
This species has a wide breeding range in the Palearctic, wintering mostly in India. Vagrants have been recorded as far east as Japan, and as far west as Spain.