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For scientists have shown that the insects talk to each other and are more intelligent than anyone ever realised. They discovered that ants communicate by stroking a natural 'washboard' on their abdomen with a body part that resembles a plectrum. Scientists had known for decades that ants make noises by rubbing ridges on their bodies.
The short answer is: Pretty much anything that eats insects and can fit ants in their mouths (and quite a few that can't). Here is a more detailed, though very incomplete, list. Worms: Ants can be parasitized by various worms, just like a dog or cat - only with more dramatic results.