Tortoises are cool. That's an inarguable fact. Tiny tortoises, big tortoises, all tortoises are cool as heck. They can live up to 150 years old, and there's even one who has lived up to 255 years. And tortoises basically carry a shield on their backs all day long and are therefore basically invincible. If that's not cool, we don't know what is.
But have you ever seen a white leopard tortoise? Now, in the hierarchy of tortoise coolness, they possibly take the first spot. Only possibly though, because, as stated previously, all tortoises are the coolest tortoises.