A Glameow's tail, once uncoiled, is nearly four times the length of its body, and is often said to look more like an electrical wire more than it does the tails of other normal-type pokemon. Indeed, it is thought that wires are precisely what modern Glameow tails evolved to resemble, for what few descriptions of these pokemon survive from the classical age compare them instead to fallen twigs and describe them as grayish-brown in color. Glameow hunt by extending their tails and laying a trap – the white puffball at the end is easily mistaken for any number of rolled-up, sleeping creatures - and their tails must therefore be disguised as common objects. For if Glameow tails are identified by their prey, the prey will stay away, and the Glameow will starve.
The peoples of ancient Sinnoh, in addition to plants, berries, and large game, often fed on the very same pokemon as the Glameow. Skilled hunters soon learned how to identify Glameow tails, and by waiting beside them no longer needed to chase long distances after Buizel or Kricketot. Initially, this gave rise to conflicts, but Glameow are too small and weak to drive off an armed, fully-grown man, and when a Glameow dies its tail disintegrates and can no longer be used as a trap, so the trappers of Sinnoh made sure to keep whichever Glameow they used fed.
It was not quite domestication. Glameow, no matter how much time they spend with a trapper or trainer, possess none of a Growlithe's loyalty; they are at best reluctant allies. But they are well aware of their role, and Glameow are willing to work with humans for mutual benefit, as they have been since long before the pokeball.