This picture makes me nervous. Radar, the Belgian horse that's officially the tallest horse in the world at about 6 ' 6" tall, is standing above the tiny, 17 inches tall Thumbelina, officially the world's tiniest mare. I'm worried he's going to crush her like a bug. It's like she thinks Radar is a barn she's standing inside. I bet they fall in love! You know what they say--opposites attract!