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This is one book but it goes by both names. Have you read it. If your not sure its about a prehistoric bat named dusk who is shunned by his collony because of his strange body and ability to fly (the other bats can only glide) and a prehistoric mink like creature called cassinial who is bloodthirsty and visios and prefers meat to bugs so he is thrown out of his pack along with other like him.

It is written by Kenneth oppel so do you like any of his other books.

I've heard of this one, but I have yet to read Darkwing. D: The only thing I knew about it though was that it's the prequel of sorts to Silverwing which was reason enough for me to want to read it. haha.