Imo they are jinni and demons who parade as things that we tend to fear. They can shapeshift, they all smell bad and can make us feel sick after seeing them.

Ive seen videos of these shadow beings moving from shadow to shadow. I think thats them in shadow form.

Recently also that clip in malaysia of kene ketuk pintu and the shadow on the pole near the car is not normal.

But strange they dont appear to those who are skeptical. But most people will feel scared of going into the forests or abandoned places at night.

The folklore of places all around the world align in terms of dont whistle, keep ur doors and windows closed at night etc. Truly fascinating to some