Only one of the pair in box 2 was present again last night, it looks like he/she has either been taken by a Hobby (they have been seen here recently), or maybe he/she has just decided to 'go home' and leave the other one to it. Either way, the single one left behind seems to be managing OK so far. The swiftlets are two weeks old now and are getting proper little muppet faces on them and almost climbing out of the nest. Here's a short video taken this afternoon while one of the parent birds visited.
So, wonder if the missing parent will turn up tonight?