"Winged predator hits all-time high in San Francisco
The numbers doubled in the span of a year
The number of American crows, savvy predators known to congregate during winter, has reached an all-time high in San Francisco.
Over the holidays, birders tallied 3,260 crows in San Francisco during the National Audubon Society’s Christmas Bird Count. That number is an astounding sum, considering in 1984, there were just five crows documented in the city.
(. . .)
It’s not just San Francisco. Based on aggregated Christmas count data, the Golden Gate Bird Alliance reports a sharp rise in crow numbers across the nine Bay Area counties over the past five years and an overall trend upward in local populations since 1975.
(. . .)
Phillips pointed to another explanation behind a historical trend of crows moving away from rural places. In 1972, the Migratory Bird Treaty Act expanded to include crows, strengthening their protections from hunting and helping their populations to expand. Yet today, people can still kill crows in most rural parts of the state, where they are notorious for eating crops on farms."
https://www.sfgate.com/bayarea/article/crow-populations-san-francisco-21316117.php


















