It was maybe 2 or 3cm in length. It was running fairly quickly on top of a large hollow log holding another small winged-looking insect in its mouth. I took one photo and the rest are screenshots from a video. I'm hoping someone can help identify the species of ant. I'd be happy to know what it's holding too. Its antennae were flipping up and down even quicker than it was moving.
It was holding a caterpillar, the caterpillar spun silk and tried to struggle, and the two of them ended up hanging in the air.