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You have to breed a sun and moon dragon together
It will make a lichen dragon
a earth dragon
Two moon dragons would make another moon dragon. Two of the same type of dragon always results in the same dragon. The time of day does not make a difference when trying to get a sun or moon dragon. That was a rumor that started just after their release, and still hangs on due to old forum posts.
Mountain
Cold and lightning
There is no such thing as a Birthstone Dragon on DragonVale
I got mine with a magnetic dragon and a lichen dragon and got it while trying to get another apocalypse dragon.
A normal fire dragon bread with a water dragon
A lichen, poison, bluefire, or frostfire dragon.
You would either get a Cactus dragon, a Storm dragon, a Lichen dragon, an Ash dragon, a Hail dragon, a Sun dragon, or a Moon dragon.
As of July 2012, there has not been a star dragon in DragonVale.