I know that in melee, SCVs, marines, marauders, ghosts and reapers can enter a bunker (and I assume so can medics, firebats and spectres in the single-player). Can any other unit types enter a bunker? In particular, can any non-Terran unit enter it? (assuming it somehow got under your control in the first place)
And if any other unit can enter a bunker, how much space does it take? Same as with transports?