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• a  of or relating to or characterized by neoteny

• He has shown that the young in such species were neotenous -- or cute, as Horner puts it more plainly; until maturity they were gawky, with such vulnerable traits as enlarged heads .
• He has shown that the young in such species were neotenousor cute, as Horner puts it more plainly; until maturity they were gawky, with such vulnerable traits as enlarged heads .

• neotenic