The federal government is planning to round up and remove potentially hundreds of wild horses around California’s Mono Lake, the ancient saltwater body where mustangs have unexpectedly arrived from along the Nevada border in numbers that haven’t been welcomed. … One concern is Mono Lake’s famous tufa towers, which the mustangs have been seen using as scratching posts. … Freshwater springs around Mono Lake have recently become popular gathering spots for the horses, an influx that many say has caused the lake’s shores to be trampled, meadows for shorebirds, duck and songbirds to be mowed down and geologic oddities like the tufa formations to be put at risk.