Pretty sure I was called by something familiar, the day before I had seen a guy in what appeared to be gray spandex, large darker gray boots and gloves, walking away from my house into the forest. They said if I saw anything strange to contact them, I didnt save the phone number sadly, but a black vehicle with two men in it wearing black suits with sunglasses were sitting in my driveway eating Mcdonalds, when I questioned them they said they were "inspecting for tansy" (tansy is a kind of poisonous weed that grows in my area) I just asked them to get off of my property and they did, instead sitting on the road near my house, with binoculars. A while later i saw the gray spandex guy again and tried to follow after him, all I saw were footprints vaguely in the shape of a HUGE boot, and a bunch of disturbed plants. There was no animal activity at all after that, not evendors birds chirping. Haven't seen the giant gray dude sense.
Did you call the police? Some strange men on your property spying on you warrants a call to the police not some goofy fake agency. And why the heck would you follow this costumed character anywhere let alone into the woods?!] Call the police if you see him again, don't follow him.