it seems like these guys are ambushers, hunting from the rooftops and treetops. Perhaps the next evolution of jumpers. The one that hit tardust jumped out of a tree, and onto the passenger side door and latched on to him. And then back at the army base, Angel said there were two small ones on the roof, and that they were hunting Angel/kalani. Maybe they're a hybrid? a cross between a smart one and a jumper (dont ask how) they seem to have some level of intelligence, if they are to stalk their prey. Definitely seem more intelligent than the normals who just run at you on sight. Either way these things are among the most dangerous kind the tower's encountered.
kinda reminds me of the jockeys from L4d 2
http://gamingbolt.com/wp-content/upl.../11/Jockey.png
that's what I imagine they look like, but maybe smaller?
http://www.teamwarfare.com/content/n...4d2/Jockey.jpg
and here's what they do to you in game