Annual report nest box 10. 2004. Eilenbergcolony.

	I think that one Common Swift didn't come back and the Common Swift that, at the end of the season stays in nest box 12, has taking his place. This is based on the behaviour of one of the birds during the first days of the season. As long as we cannot identify we must guess. This year we also have follow the Common Swifts in detail from arrive until leaving by detect system. The report is completed with photos and a sound of fighting Common Swifts. (Digital logbook)

01-05	2 Common Swifts stay the night in the nest box.
04-05	1 of the two Common Swifts goes in the other nest boxes.
05-05	1 Common Swift stays the night in the nest box.
11-05	1 egg in the nest. With photo.
14-05	Second egg in the nest.
20-05	Observation; There are 3 eggs in the nest. One time they are breeding for almost 4,5 hour.
28-05	Great Tit visits de nest box.
01-06	First young Common Swift.
02-06	Second young Common Swift.
03-06	Have a try to take the nesting-place. With sound of fighting Common Swifts.
05-06	Third young Common Swift.
06-06	Observation; there are just 2 young Common Swifts in the nest. With photo.
16-06	I made a photo off the young Common Swifts.
14-07	22:52 first young Common Swift leaves the nesting-place.
16-07	10:05 second young Common Swift leaves the nesting-place.
29-07	1 Common Swift doesn't come back in the nest box.
30-07	Second adult Common Swift even doesn't come back.