Sorry about the weird double image - I'm still figuring out this camera. It's a lot like my old one, but I was still figuring that
one out when it was stolen.
I feel like this is not the same ant species that I typically find with killer mushrooms growing from their heads, but I don't know too much about ants and this may just be a different caste. Or something.
Here's an example of the ants I more commonly find with mushroom-heads (albeit in a different swamp, about 40 miles away on the other side of the Mississippi River):