They are after you with the soul purpose of feeding on your delicious flesh.
The Decent is one of the many movies starring Bumans as the protagionist, you can get a small look at them, but not for long. Along with the Burrowers.
Note: They can not fly like bats, just climb and jump really well.
Jeepers Creepers is not considered a buman but in a distant family catagory.
"That Buman looks like a ninty year old man with cancer."
"After I watched that movie, I have to bumanize my locker."