Eastern Marsh Harrier Circus spilonotus
Estimated average number of individuals by week based on eBird data, Jul 2013 to Jun 2023
Peak week Nov 05-Nov 11
Early date 03 Oct 2017
Late date 11 Apr 2000
Wintering birds of this species are hardly seen nowadays due to loss of their grassland habitat, so the raptor migration in Oct and Nov is your best bet for this species, as with most other scarce raptors.