California mute swan numbers halve after hunting law takes effect

Governor Gavin Newsom signed legislation that allows property owners and licensed hunters to kill non‑native mute swans. The law, which began on Jan. 1, was aimed at curbing the invasive birds that threaten wetlands in the Sacramento‑San Joaquin Delta.

A new waterfowl breeding survey from the California Department of Fish and Wildlife shows the state’s mute swan population fell from about 15,000 to roughly 7,400—a 53 % decline in less than a year. Wildlife officials say the birds, which can weigh up to 30 lb and do not migrate, damage native vegetation and harass other waterbirds. Despite opposition from animal‑welfare groups, the measure remains in force until Jan. 1, 2031. “Let’s hope that things trend in our favor,” said Melanie Weaver, the department’s waterfowl coordinator.