You happen to be watching your bird feeder at night. You see something that looks like it flew on it but was definitely not a bird. What could it be? Most likely, you have a flying squirrel visitor. These charismatic seed thieves are common in Massachusetts but are not usually seen because of their nocturnal habits.
Don’t let their name fool you—flying squirrels don’t actually fly. Rather they have a built-in “paraglider,” a membrane that stretches between the legs and lets them soar as far as 150 feet. Like other cavity nesters, they will sometimes use birdhouses for nesting or protection.