I observed Peregrine Falcons Falco peregrinus preying on House Swallows Hirundo rustica, which were going to roost at two sites, Tottori and Wakayama. In both cases, Peregrine Falcons preyed on a House Swallow flying in flocks over a reedy marsh after sunset. It is suggested that the Peregrine Falcon regularly preys on House Swallows at dusk from summer to autumn, if the House Swallows roost is located in the home range of the Peregrine Falcons.
