Norwegian Lundehund

Lundehund, the rarest breed of dog with six toes, ability to turn its head 180 degrees, rotate their legs over their heads, and even lie completely flat, with all four legs sticking straight out to the sides. The Lundehund is also able to clamp its ears shut to protect them from wind and rain. That kind of ability helped them in often adverse weather conditions. But their extreme flexibility, turning their heads, and moving their legs and joints at strange angles, helped them squeeze in and out of tight spots while on the hunt for puffins.