The Deadly Nadder is said to be one of the most beautiful dragon and are very fast. It is well known for its poisonous and painful spines with its magnesium fire it can melt metal or rock easily.
The Deadly Nadder is very beautiful and bird-like. It is bipedal and possesses winged forelimbs and it is about the same size as medium sized tetrapod dinosaurs such as Allosaurus. Its small yet keen eyes, equipped with poor binocular vision, are one of the tools it uses to stalk its targets.
Its body is a vivid color, with a light beige underbelly, while its wings are mottled, darker shades. In front of its eyes is its curved nasal horn, which is often used to batter opponents; its lower jaw is shorter and wider than its upper, giving it an overbite. Ringing its skull are a set of spikes. Coating the tail is a series of spines that can inject venom into a target. When relaxed, its head spikes and venomous tail spines lay flat, and when alarmed, they are shot upward to intimidate its foe. The tail spikes can also be used to make a rattling noise which it makes right before it attacks, similar to rattlesnakes. The tail not only shoots spines it's a prehensile tail as well. It also has an incredible sense of smell and enhanced speed.
The Nadder eats fish, plants, and chicken. If you feed a Nadder chicken for some reason it increases their speed making them incredibly fast.
Titan Wing Deadly Nadders have more spikes on their head, back and feet. Their snouts are broader as. Their body is greenish with pink lines and they possess some blue spots on the wings.
The Deadly Nadder also has, at its disposal, a tail that is covered in bristling poisonous spikes, which are used as projectiles to stun or immobilize its prey. Its tail spikes are its preferred weapon. It can launch its tail spikes with devastating speed and accuracy. If you place a hand on its front neck, just behind the frill. The reaction causes them to fire a single spine shot that had so great accuracy to even slice another spine through the middle. This could be result of hidden secret ability for Nadders as other Nadders seem to be surprised themselves to have this ability. They also have a pressure point on the neck, which disables the dragon. Their spines are so sharp they are made into spears.
This dragon happens to have a blind spot right in front of their nose as it does not possess a binocular vision. By staying in its blind-spot, most trainers, or hunters, can carefully evade this dragon's watch. When Nadders shoot their spines, their belly is always exposed, making it an easy target for Dragon Hunters, or other hostile Dragons. In addition, Nadders have a special spot under their chin, which when scratched, is extremely comfortable. It has a similar reaction of dogs being scratched, Nadder's eyeballs roll up, they gape their mouths open in comfort and their spikes preen downwards. When stroked correctly, some Nadders may collapse momentarily. Also, if you have an already trained Nadder, they are easily bribed by chicken. When these weaknesses are used, this dragon could potentially fall under the influence of other, be it good or bad. Along with the poisonous spikes their teeth also contain venom.
In terms of behavior, the Deadly Nadder is very fast and dangerous, though its potency as a hunter is hindered by the blind spot directly above its nose. As a result, the dragon relies on its keen sense of smell and hearing, often instead of its binocular vision, in order to find its prey. Their great sense of smell were the reason they were reclassified as Tracker Class dragons. Baby Nadders can smell a human from one-hundred feet away, although it is currently unknown if the distance increases as they mature.
Before Fireworms, Nadders had the hottest fire of all dragon species and still have one of the hottest. It's been said that the Nadder's fire is hot enough to melt metal and turn people into ash. Stormfly also has been seen melting solid rocks within seconds. Nadders has also been to use a type of fire similar to a Razorwhip.

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Book of Dragons
FantasyMost things we know about every dragon species I could find. (Dreamworks Dragons)