In herpetological terms, a pinky is a
newborn, (1-7 days old) mouse,
usually a staple feeder for smaller colubrids or baby constrictors, or as an occasional treat for bulkier lizards such as blue-tongued skinks. Pinkies are cheap, anywhere from 25 cents to a dollar, and are best fed live, for their movement attracts
the animal, and they aren't harmful yet.