In the summer of 2002, a pair of Hobbies bred in a nest of a Carrion Crow Corvus corone, situated some 9.5 m high in a willow, in the centre of the city of Utrecht. The site consisted of a deserted railway switchyard (2000 x 400 m), some 2-3 km away from the nearest farmland and from the suburban outskirts of the city. Three fledglings were recorded in late July. Underneath several plucking posts, 18 prey remains of 9 bird species were collected (Table 1), of which a third consisted of Swifts Apus apus, an abundant breeding bird in Utrecht.