This is a video of Swiftlets feeding their babies, it is a rare footage shot by a friend of mine. For those who have never been to a Swiftlet farm before this is a good opportunity to see how Swiftlets feed their babies.
Parents normally will come back to their nests few times a day to feed their chicks. It depends on the season. During the dry season where food is scare the parents will travel far, during this time they may only come back once to feed their chicks.
From this observation one may learn when is the best time to enter the farm. Going into the farm at the wrong time of the day may frighten the birds.
Many thanks to my friend for sharing this video with us.