Now zoo staff and even police are trying to find the missing red panda.
The police department has loaned a geothermal camera to the zoo to help find Sunny.
Staff told the Virginian Pilot that they hope she's still on the zoo's property, but she may have been able to get out into the neighboring areas.
Zoo officials say that while red pandas are normally not aggressive, she could be unpredictable and that if she is spotted to alert zoo officials and not approach her.
Sunny is 19 months old.