Thanks for your reply Tsu...
but you claim that I should not bother ant hills unless that are in my
"livingroom"... so how do people enjoy backyard football or volleyball
when they have to look down every 6 steps to avoid stepping in or
fallin gin a 2 foot wide anthill?

I have become for the first time enthrawled with ants now.. I just
keep catching myself on the internet learning more and more about
thier behaviors, but I havent found out who thier "enemies" are.. I
would think off hand birds, but if that were the case, my backyard
would be full of birds having a feeding frenzy... who are ants natural
enemies?