Nick22:
Hmm. I'd have to say the 3 Lipizzaner stallions Hans, Werner and Franz didn't quite turn out the way I wanted them to. I wanted them to be comic relief but I just couldn't do comedy right.
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LB&T:
I'm not sure. While I would LOVE to see a Darwin's Soldiers trilogy, I'm not sure what the plot of the 3rd one could be. So the answer is up in the air.