The NXTLog Challenge this summer is to build a robotic pet! Real and made up animals are all allowed. Awarded categories will be: Domestic Pets, Exotic Pets, Creative Pets, and Interactive Pets. The deadline is August 31!
Read more about the challenge here.
You might find inspiration from Fay's LEGO MINDSTORMS ZOO or Robots Alive! Endangered Species books, as well as the Internet. Good luck and happy building!