They are "Purely Nocturnal" VERY RARELY otherwise.
If you are to shoot a Watcher itmust be at night and from a long way away. And only then after great patience.
You will not recover the corpse though, so why try.
They do indeed "watch" us. Have forever.
They know that a human and the "boomstick" make bad things happen.
Just like we know a rattlesnake is best avoided and a black widow the same. It has been passed to us through communication.

Our anscestors hunted them to near extinction just as we did the Cave Bear and American Lion as well as most all species.

I have read old scandinavian legends that state a war between themselves and smaller darker complected peoplealong side"hairy giants" aided with wolves.I am unsure of where this took place but the Vikings were good sailers and great battlers...according to the legend they were driven back...maybe they made up the "hairy giants" to make the defeat sound better but I dont think so...the Vikings respected battle, it was their way to Valhalla(spelling?) They surely would respect the warriors who defeated them and would look forward to seeing them in their "heaven" Noneed to exagurate defeatfor reasonof beliefs...