User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4820236-20120410032958/@comment-5043481-20120813172326

Its the size, not the species that counts. Ants lift 20-30 times thier body weight although most humans cannot lift twice thier weight.

It is because the creature is using less muscle and structure to support itself when it is smaller. If an ant were born the size of a man it would not be able to support its own weight on its spindly legs.