The list of birds was good with 41 spp. (see what I mean about birding or working?) with no less than 5 spp. of birds of prey including Hobby and Common Buzzard, 4 spp. of tits, and a large colony of House Martins under the eaves. It was while he was watching these that Samu saw Little Swifts A. affinis entering these, with a maximum seen of 3 birds, which naturally made him think of at least 2 pairs, making an interesting extension of breeding.
Samu's report and spp. list (in Spanish, of course, and not in list order) was published in avesforum and is reproduced below.