There are over 6,500 lizard species, but the Komodo dragon wins the prize for being the largest living lizard in the world! It is a type of monitor lizard, an ancient reptile species with ancestors that date back more than 100 million years. This awesome reptile can grow up to 10 feet long and weigh up to 360 pounds. There are two Komodo dragons at the Zoo: an adult at Kenneth C. Griffin Komodo Kingdom and a juvenile in the Reptile House, both in the Reptile Walk area.