The Deadly Nadder is a dragon species from the animated series How to Train Your Dragon. Known for its striking blue and green scales, this dragon is characterized by its sharp, spiky back and long, slender tail. It is a medium-sized dragon that can reach impressive speeds in flight and is known for its agility. In the series, the Deadly Nadder has a unique ability to shoot explosive fireballs from its mouth. This makes it a formidable opponent in battles. The dragon is also known for its intelligence and strong bond with its rider, often displaying loyalty and bravery in various situations.