Snakes and Centipedes

PB_Worm (really a centipede) and PB_Snake are long creatures that get smaller each time you hit them.  They follow nav points like regular creatures, and can climb up walls.   Place the head actor where you want it to start, and can change the length of the creature in the properties.

There are also special triggers called PB_SnakeSpawn and PB_CentipedeSpawn that allow you to set the length when they are spawned.