In the Nursery on Isla Nublar, there were several rags and toys, for the benefit of the various infant dinosaurs that were housed there. However, during the time of the inspection of the island, there was only one animal currently in the nursery, an infant raptor. The rags were most likely used for the carnivorous infants to practice teething, and during the inspection, such behavior was performed by the infant.
Jurassic Park By Michael Crichton, Page 107,110 (First Edition, Thirty-fifth reprint)
