Two gorilla sisters teased their grandmother by climbing on her.br br Footage shows Mobi and Gaia playing with grandmother, Kijivu.br br The playful sisters took a snack break - before they started climbing again.br br The video was filmed by Lucie Štěpničková, 38, at Prague Zoo on March 14, 2025.br br Lucie, a saleswoman, from Prague, said: "Both of them climb over her back in different ways, as if massaging her and using her as a climbing frame. br br "Then they sit down, each on one side, and have a snack, usually just before they start another fight together.