AN ANATOMICAL MISCELLANY

A male’s nipples

Silverback mountain gorilla, Volcanoes National Park, Rwanda

EVOLUTION FASHIONS BODIES THAT are exquisitely adapted to their environment. It’s not perfect, though. Why, for instance, do male mammals have nipples when only females need them? Males and females develop along very similar lines using much the same genetic recipe. Characteristics of one sex will, then, be expressed in the other as long as they don’t confer a disadvantage. Male nipples neither help nor hinder.