>>150027663
It's less about their biology and more to do with them being small. Smaller animals will have an easier time picking up heavy objects relative to their own weight. So for example if you were to enlarge an ant like in pic-related to human size it wouldn't be able to go around lifting boulders up like it's nothing. There's like a whole science behind it.

Size governs a lot of what a body can do. For example a housecat can easily survive a fall off a tall building, but I doubt if you threw a giant tiger off that it would fair so well.