KGW: 'It's like there's thousands of them': Crows return to downtown Portland
It seems as though every year, the congregating crows catch people off guard.
John Notarianni: Murder Stats: Mapping The Influx of Roosting Crows in Portland (OPB)
Thousands of crows flock to Portland's park blocks each winter, darkening the sky at dusk and roosting overnight in the city's trees. Much about the crows' habits is unknown.