The Primal Urge is a science-fiction novel by Brian Aldiss. It was first published in 1961. Brian Wilson Aldiss (born August 18, 1925 in East Dereham, Norfolk) is a prolific English author of both general fiction and science fiction. ...
The book was banned in Ireland.
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They muse that some mysterious impulse, some "urge," caused animals and fish to "evolve"; that a "loosely-hanging scale" on an ungainly caiman eventually "evolved" into a feather; and that crocodiles and hummingbirds are related!
Of course, this "force," this "primalurge," before whom they bow and scrape does not tell them how to live.
It does not define the difference between moral behavior and sin; nor does it inform them about the purpose for their human existence, and their ultimate destiny.