{"fact":"Before heading to their roosts for the night, crows congregate in pre-roost gatherings, where they engage in a variety of vocalizations.","context":"As crows move towards these roosts around sunset, they gather in pre-roost aggregations, in which they make numerous vocalizations (Moore and Switzer, 1998).","source":"Shima H. Abadi; Douglas W. Wacker; Jeremy G. Newton; Derek Flett, Acoustic localization of crows in pre-roost aggregations., 10.1121/1.5138133","index":506}