Kael
Deity
I believe you could set animals to <bAlwaysHostile>1</bAlwaysHostile> without giving them HN status. That should allow you to always attack and be attacked by the units, but you would still know who owns them and the tag would not carry over when the unit is upgraded to something with <bAlwaysHostile>0</bAlwaysHostile>
Yeap, and it would also keep you from being able to remove their AlwaysHostile-ness by declaring nationality.