The Eurasian Hobby (Falco subbuteo) has a wide distributional range and most individuals are migratory, with western birds wintering in Africa and eastern birds in southern Asia (BirdLife International 2015). It is an uncommon passage migrant and scarce summer visitor in Hong Kong (Carey et al. 2001). This small falcon usually feeds on flying insects and small birds that it catches and eats on the wing (White et al. 1994, MacKinnon et al. 2000, Ferguson-Lees and Christie 2001, BirdLife International 2015), but bats are a known prey item in Hong Kong (Carey et al. 2001, Turnbull et al. 2004, Carey et al. 2010, Welch 2012). Hobbies are usually diurnal, but they can be crepuscular and even nocturnal on migration (Ferguson-Lees and Christie 2001).
I observed a Eurasian Hobby preying on a bat...