Create enum list at runtime

Hi
I have an enum set say tiger=0,
lion=1,
deer=2,
snake=4
These enums are to be displayed in a list box which is dependent on a combo box. The combo box will have values like carnivores,herbivores,repltiles.
So when I change my selectedindex the value in the list box(ie the animal names) should also change. So if I have carnivores, I get lion and tiger. If i have reptiles , I have snake.
Please suggest the respective xaml and the necessary code required. Its very urgent.
Thanks