Described as the “jet fighters” of the avian world, falcons are able to achieve remarkable speeds when diving on their flying prey, making them amongst the fastest animals on the planet. Pointed wings and a a “tooth” on the hooked bill distinguish them from other diurnal raptors, and most nest in tree-holes or on cliffs rather than build a stick nest. Flying birds and large insects are the usual prey, but small reptiles on the ground are also taken. Eight species of falcons occur in the Greater Sundas, five of which can be found on the island of Java, and four of which occur in Baluran: the Black-thighed Falconet, whose global range is mainly west of Java (but includes Bali, where it is scarce) and the Spotted Kestrel, whose range extends from Java eastwards to Timor; and the cosmopolitan Peregrine Falcon, which is rare in the park.
Fast flapping, then gliding, or diving; sometimes calling in a high-pitched voice. Also spectacular displays, including high speed chases, aerobatics and talon-grappling.