Worry - a state or feeling of anxiety
Monkey - any of various long-tailed, medium-sized members of the order Primates, including the macaques, baboons, guenons, capuchins, marmosets, and tamarins and excluding the anthropoid apes and the prosimians.
Swiftly - quickly, immediately, fleetly
Scamper - to move quickly with short light steps
Safety - the state of being safe and protected from danger or harm
Oxford Advanced Learner's Dictionary