Ryouma pondered on why the slime suddenly evolved and he figured that the culprit must be the Green Caterpillar.
For meals Ryouma generally fed the slime his leftovers and during hunting, he would continuously feed the slime the dead green caterpillars that kept appearing. He figured that was probably the reason. Wild slimes were at the bottom most of the ecosystem. Normally, without being able to catch their own preys to eat, they are only left with the choice of swarming over the corpses of the dead.
With that in mind, Ryouma had his meals every day and the left overs of that meal were given to his slime to eat. In other words, Ryouma’s slime is different from wild slimes and is able to eat every day. Moreover within the meal of the slime were some viscous body fluids. The green caterpillars that spit viscous threads were included in the day to day meal. Ryouma considered this to be a probable hypothesis for the evolution of the slime.