...and then the whole 'It's a different planet' thing should be able to account for how a bird descendant manages to grow an enormous abdomen later in her life. Maybe it's a hormone thing, like growing tits.
Did we cover the selective fertility thing or not? What stimulates a Mudokon to grow with sexual organs or not, that sort of thing.
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Imagine if we had usurper bees, they'd be extinct in weeks.
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I'd just like to point out that we do have usurper ants, with a reasonably good success rate.