I swear with that third point their IQ doubles if not triples.
I got to about 20 yards from two very similar ones last weekend. They finally did figure out they should be worried about me and hid behind a tree. As in, ran 10 yards, put their heads behind a pine so they couldn't see me. Then they would lean around the tree and look at me and duck back. Pretty sneaky except their entire bodies were visible the whole time.