Gossau 15.04.2016

I arrived to the green roof in Gossau at 15:00, I couldn’t recognize any Kiebitz on the roof, not even on the nests. After some minutes, maybe 15 minutes, I saw one Kiebitz flying around predators (5 big birds flying in circles). When the predators were a little farther a male Kiebitz flew to the roof and stayed there until I left. The first female arrived 30 minutes after my arrival to the roof and sat on the nest and the second one 45 minutes and sat on the nest. I couldn't see the second male near to the place.