The devastated knoll in Sha Kok Mei was home to many species of dragonfly and rare birds, according to environmentalists from the We Love Mau Ping Association. Naturalists James Wong Ming and Stanley Chan Kam-wai conducted a survey last year listing the area's species. These included a sighting of the rare black baza. 'There was a small family there of two or three juvenile birds,' Mr Wong said. 'They usually visit from April to August. But with the trees gone, I doubt if they will be back this year.' The association plans to recruit student volunteers this summer to do a survey of birds, butterflies and dragonflies in the valleys around Sha Kok Mei. The black baza, or cuckoo falcon, is a small to medium-sized kite with long, pointed wings.