 How were the Volpla able to eat solid food so quickly?
Yet I had always been so sure I could create them that I had been calling them volplas for ten years. Again in the laboratory, I entered the metabolic accelerator and withdrew the intravenous needles from my first volplas. The accelerator had forced them almost to adulthood in less than a month. It would be several hours before they would begin to move, to learn to feed and play, perhaps to learn to fly. By four o'clock that afternoon, I was feeding them solid food and, with the spars closed, they were holding little cups and drinking water from them in a most humanlike way. There would be volpla colonies all up and down the Coast before anyone suspected.
 Their growth had been artificially sped up, so they passed the stages where they would have needed different food
 Their anatomy is not human, and their more developed digestive system handles solid food much earlier  They mature very quickly, as a result of their mutant status, so it would be easy to eat anything  Their growth had been artificially sped up, so they passed the stages where they would have needed different food  Solid food was the only thing they were offered, so they learned to eat it