Apparently many people have been noticing that the squirrel population in Massachusetts and possibly throughout New England has been particularly high this year, often having noticed an abundance of squirrel roadkill or a lack of acorns first. I’ve certainly noticed – and welcome – the latter myself. It looks like we might be headed for a repeat of the 1968 squirrel migration. In that case, there was a bumper crop of acorns and other squirrel food one year, followed by a lean year. The squirrels from the first year responded by producing more young than usual, and then those young found themselves having to forage further than usual for a much smaller per-squirrel food supply. This led them to cross roads etc. more frequently, leading to the increase in roadkill. It’s a classic biological boom/bust cycle, taking place – literally – right in our back yard. We should be able to predict time-delayed booms and busts in the populations of squirrel predators (e.g. foxes) and scavengers such as crows in the near future.