Silver-backed Needletail Hirundapus cochinchinensis
Estimated average number of individuals by week based on eBird data, Jul 2012 to Jun 2022
Peak week Nov 19-Nov 25
Early date 08 Sep 1990
Late date 07 Apr 2001
All confirmed records in the last 10 years have come during the months of Oct and Nov, and mostly seen at the end of Nov.