They live in trees a lot of the time. Little ones in any kinda tree, big ones and all sizes in big, tall trees. It would be dumb to hang around on the ground when you could be up a big tree with a nice breeze and be safer, see intruders sooner, spot game animals more easily, and be away from dirt, floods, most bugs, and prowling predators, including those pesky little naked people.
Leaves shield your presence, smell nice, are delicious, and make enough white noise to cover up the sound of your clan’s snores and farts. Better yet, the naked people don’t even look up in a tree if they are roaming around.
Lightning — so don’t go for the very tallest tree around
Falling out — make little baskets and walls to contain those more likely to fall
Being blown out — construct mid-tree wind shelters for those windy days. A big gust is good for trying to take pictures of them up there, because at that moment they are more interested in holding on than in hiding.
Bigfoot up high weave screens from leafy branches, which is one reason why they are hard to spot.
They also lash branches together and otherwise manipulate the growth of trees to form shelters and shapes. I have seen a large cottonwood that had a big weblike spiral. Amazing. No pictures, sorry.
I also notice that up in trees you often find what I call a window. There is an opening in the leaf cover. I think it’s to look out from but mainly to vent the wind through so the tree doesn’t blow over from the force of the wind on the foliage. The leaves act a bit like a sail, but you don’t want your tree sailing away.
Perches for lookouts or sentries are another feature. Next to a trunk or sturdy branch look for a small platform with a short rail perhaps, and supporting structures.
Look for trees with bark worn off in spots where they might be climbing up into it.
In snowy weather, look for twigs and debris on the ground beneath an evergreen.
A branch pulled down to the ground serves as cover for those down there, but a larger one sloping up to the big, sturdy climbable branches is a clue as well.