I have no idea what is up with this spider's mouth. Usually, it's the person who screams when they meet a spider, not the other way around! ;)

Actually, this is a harmless wolf spider, and he has a drop of liquid in his mandibles, water most likely as it was near a stream. :D

This was a tremendously co-operative spider. It posed nicely for a number of shots. To see the actual size of the spider click here for a picture of it on a counselor's hand.