From the March 2019 issue: A journey into the animal mind In Kingdom of Play: What Ball-Bouncing Octopuses, Belly-Flopping Monkeys, and Mud-Sliding Elephants Reveal About Life Itself, David Toomey ...

The world is full of variety when it comes animal friendships ... how they can teach their own pets to play together too! Ruby is the big, furry ball of energy and Pearl is the super chill ...