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This question already has an answer here:

I believe the main protagonist’s name is Falconer. A human spaceship crashlands on a planet where conditions are inimical to human life - including a hostile sentient native species. So the humans build a large enclosure for themselves and undergo induced mutations so each succeeding generation is better adjusted to conditions on the planet than the last until finally the last generation is ready to step out of the enclosure.

marked as duplicate by Rand al'Thor Dec 29 '18 at 12:11

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Possibly Between the Dark and the Daylight by Algis Budrys. It's sort of similar to the plot you describe and it does have a character called Falconer.

Later:

Google can't find anything about the story and the Wikipedia article on Algis Budrys doesn't mention it so I may have the name wrong or it might have been published under different names. If it helps, at the time the story is set the humans have been deliberately mutated to animal like forms, and the story is about the final mutated generation who are still children at the time of the story. The base commander, Brendan, is arguing with Falconer about whether it's time to release the children to the world outside the dome. Spoiler follows:

Falconer raises a rebellion against Brendan. In the chaos Brendan releases the children, but they have been mutated so far they are little more than vicious beasts. At the end of the story the children has slaughtered all the aliens and are attempting to break back into the dome to slaughter the humans inside.

  • fantastic, yes this is the one. Did a little googling based on your hints and believe the title is "Between the dark and the daylight", appreciate if you could correct your answer. Accepting it. – iruvar Dec 10 '12 at 16:42
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    Corrected! I manage to get about one in a hundred story identification questions and even then someone else usually gets in first, so I feel wonderfully smug about this one :-) – John Rennie Dec 10 '12 at 17:39

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