[Worth1]

Originally Posted by JRinPA

They have poor close up vision but see movement at distance just fine. You can imitate a stump at 10 yards and they will leave their hole to feed, but they will see you walk across an open field 400 yards away and make a beeline for that same hole. When they are spooked but think they are still hidden, they let out a shrill whistle, sort of a like a mega version of chipmunk's chirp. Hence, sometimes they are called whistlepig instead of groundhog.

Not all of them.