Kevin and Tyler were playing yesterday, and Tyler went to the stairs and stood there looking up.  Kevin was with him on the stairs, watching over him.  I was making lunch, and all of a sudden Kevin yells "missy, come look at us!"  They were at the top of the stairs, and Kevin said Tyler had crawled all the way there himself!  (WIth Kevin right beside him, of course, but Tyler did all the climbing himself).  We sure do have a little monkey on our hands. :)