So this is what's going on down under...

the pelvis is upright, long and narrow; the thighs are long and muscular; the shin bones are elongate but not heavily muscled; the ankle is adapted to prevent the foot rotating sideways and the ankle being twisted; the tail is a counterbalance and prop; The epipubic bones can be seen protuding from the front of the pelvis: a feature of monotremes and marsupials, their function is not known.