Nashath Hafi of Field Ornithology Group of Sri Lanka (FOGSL) reports a mass movement of Pond Herons along the west coast parallel to the beach. Nashath observed this for last few days where flocks of Indian Pond herons each consist of about 10 to 25 birds flying toward Colombo. On 29th November, he counted 476 pond heron 13 cattle egrets from a location near Bamabalapitiya Railway Station between 7.55 am to 8.23. A similar observation was made today 01st of December. An observation done yesterday evening indicates that there is no reverse movement or an indication that these birds are dispersing from a night roost and goes back to the same location. So there is a chance these birds are part of some sort of migration, but we need more data.
So if you are free, living closer to coast or having somebody live near the sea who can do the observation, please help to get more data to get a count of the birds flying along the west coast in the mornings and possibly in the evening too