Although they are "undead" the playable undead show up as a humanoid when a hunter tracks them, and are considered "humanoids" for game play purposes, i.e.[Shackle Undead]cannot be cast on them. References ^abWorld of Warcraft Manual, 188 ...
Skill points equal to (4 + Int modifier, minimum 1) per Hit Die, with quadruple skill points for the first Hit Die, if the undead creature has an Intelligence score. However, many undead are mindless and gain no skill points or feats. ...