Singetail's are very territorial they also don't just breath fire they send it bursting out of its jaws, gills, and tails!
This elusive dragon prefers to scare away their enemies with long ranged attacks by hurling fireballs from their tails. The Singetail also pose in close ranged combat by shunting jets of flame from the gills lining their exposed stomachs. A Singetail's eyes are similar to a chameleons. They swivel to the sides and back of its head and gives this dragon 360-degree lay of the land. Due to this a person can't get the drop on this dragon.
Surprisingly this dragon is trainable just be sure to approach it carefully. Singetails have a wide, flat body and a long tail. They have four wings, like a Thunderdrum, but with the bigger pair being set lower on its back. They have a spiky face with chameleon-like eyes that allow it to see in multiple directions, as well as several big, sharp spikes along their backs and tails. It has eight extremities, four wings and four legs, two more than any other dragon and with the rearmost pair seemingly a modified pair of extra hind limbs, unlike the Stormcutter, which has all four forelimbs as wings.
Titans are a pinkish color with dark purple stripes on their wings and back. They also developed another row of spikes along their back.
This dragon is very fast and agile, able to dodge attacks from its foes. Larger Singetails and perhaps titan wings are even faster than the adult Singetail. This dragon is shown more in the air then on the ground, as its stamina must be really high to not to take a rest, it can be chased by its enemies for long distances. It has be able to take some of the attacks from the combined powers of the Rumblehorn, Monstrous Nightmare, Night Fury and Deadly Nadder.

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