Still just got the two pairs with young swiftlets, although we have had some prospectors to boxes 2 and 5 but these haven't roosted as yet. Here are some videos taken yesterday evening at dusk as the parent birds came back for the night. Box 1 parents feeding the youngsters:
And Box 3 parents feeding their youngsters - the second parent comes in
part way through the video to help out with the feeding...notice the
difference in size between the two sets of swiftlets!