The fold in the ears was caused by a heritable, dominant, mutated gene.
In one combination the initial may remain; thus *oinos cupidus gave un cybydd," one miser "; in another combination it may have originally stood between vowels, and so is mutated, as in *dud cupido, which gave dau gybydd, " two misers."
Half the rice grown in California is a descendant of Calrose 76, created when gamma rays mutated some regular rice and the resulting mutant produced more grain and less spoilage.
The gene mutated accidently, but once noticed, breeders bred for it.
It didn't spin webs and looked more to Evelyn like a mutated cat, but the moment she recalled Kiera's fear, she also realized that the cat-like creature would easily pass as a large spider.