We are living in a time when myths and legends emerge, take form and evolve. For as long as anyone can remember, there have been stories about leprechauns and the like, dozens of names all representing little secretive creatures who cause mischief and are wholly responsible for missing socks.
Plenty of variations and folklore to cover anything unexplainable ever. Certainly there was no need to invent a new creature like the Minagee. But arrive they did.
Mostly small children spot them, as they often play close to the house floors and field floors of our world. It was a child who named them, attempting to say miniature. Farmers too, and cleaners. No scientist has seen one yet, but that is simply down to too few looking.
Farmer Marcus was collecting acorns when he saw a trail of minagees, dozens of them in a row, weaving through the pasture grasses like ants, only more deliberate in their marching and slightly bigger. Fascinated, he lay down and tried to get an eyeball close enough to see what they looked like, what type of insect they are. That failed when they perhaps saw him and changed direction, and there were more grass stems put between them and his eyeball. So Marcus knelt over them and tried to entice one to walk up a twig that he held in their path. And it worked! One ran up the twig (he now knew they could run very fast) and into his finger and bit him with such intensity that he half-screamed and then looked around at the curious cows, embarrassed. He told his wife, who told the neighbors, of the nasty insects that are best avoided, and are most likely the minagees that some local kids had been banging on about. But they were definitely insects he said, because farmers know about such things, and “miniature naked humans with spears” has simply arisen from the imaginations of little uns.
Meanwhile the minagees were evolving tactically, and had decided that humans were best avoided, and added them to a long list of birds and insects that wanted them dead. This land is inhospitable, so they need to create permanent shelter, study their surroundings a whole lot more, and make babies.