The Tarzan Twins, like all well-behaved twins, were born on the same day and, although they were not as "alike as two peas," still they resembled one another quite closely enough to fulfill that particular requirement of twinship; but even there they commenced breaking the rules that have been governing twins during the past several millions of years, for Dick had a shock of the blackest sort of black hair, while Doc's hair was the sunny hue of molasses candy.