Read "The Mote In God's Eye" it's co-written by Niven IIRC who was one of the greatest world builders/creature crafters (everything he dreams up is always cohesive, mot just at a societal level but an evolutionary/fundemental one). Anyway, it makes libshit heads explode because it's about a Christian space navy containing a race of aliens who seem real nice and sympathetic but who reproduce far too fast and would utterly destroy the galaxy if they were allowed to leave their bubble.
That was a great book. There was a sequel, The Gripping Hand. Took em 25 years to write it. I tried three times to get interested in it..
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