When Hippo is traveling or just playing tourist around town, he likes to bring along his stuffed hippopotamus, Tiny.
Tiny is very comforting. He is also a good model to pose in pictures while Hippo documents his travels. Sometimes he seems to take on a life of his own.
Tiny enjoys all the exciting things that Hippo shows him. And Hippo gets more adventurous when he has Tiny to entertain.
It's a little embarrassing when Hippo goes through a security check and has to reveal the stuffed animal in his backpack. But the screeners usually just smile and let him through.