Kerstin is playful and likes to balance objects like coconut shells, lettuce leaves and articles of clothes on her forehead, as if they are serving as a hat, when she notices someone watching her. She is also one of the chimpanzees that regularly plays with toys and sometimes these end up on her head as well!
She is often seen exploring the forest, although when Kerstin first arrived at Chimp Haven it was a rare sight – she preferred to stay inside or near the walls of her enclosure. She has made progress! While Kerstin generally likes to keep to herself, she has been known to entertain herself by making noise to agitate the rest of her group and get their attention or the attention of staff.