Willosaur

The Willosaur or Willosaurus was a tripedal, carnivorous creature showcased by Will Wright at the Game Developers' Conference in 2005. Originally nameless, fans quickly took to refer to the creature thus. The dominant culture of Willosaurs on their home planet of Tamaran developed a Dr. Seuss style city with multi-colored, rounded buildings. They also retained some of their creator's humor in the spacefaring stage, where their old enemies were dropped onto planets without atmospheres.

The Willosaur has the distinction of being, in a limited sense, the first ever user-created creature of Spore. Also referred to as "Tripod".

You can track the journey of the Willosaurs by viewing the GDC gameplay video on Google Video here.