While I don't pretend to understand the musculature of an ant compared to a monkey, it is well known that smaller creatures have a higher potential for better weight to strength ratios.
My guess? Leverages and fast twitch muscle fibers. Plus testosterone.
Oh yeah, and on Discovery a few years back I saw a program pitting many animals together to see who would win amongst all of them. The winner was a surprise: a polar bear.
I would've thought a Liger.
Liger's are ridiculously huge, I really would have thought they would win aswell.
dont forget that chimps are made for pulling. long arms and short legs.