id author title date pages extension mime words sentences flesch summary cache txt 2300 Darwin, Charles The Descent of Man, and Selection in Relation to Sex .txt text/plain 311799 17064 69 foregoing, the males and females of some animals differ in structures male differs greatly in colour from the female, as well as from the As the males and females of many animals differ somewhat in habits and The sexes do not generally differ much in colour, but the males are being widely different in the males and females of certain species, In most cases the males and females of distinct species that the males of some species differ widely in colour from the females, females; and yet, when the sexes differ, the males are almost always the the females in comparison with the males cannot be accounted for, as Mr. Wallace believes to be the case with birds, by the greater exposure of When the male differs in colour from the female, he generally exhibits differences of, with those of man; fighting of males for the females; ./cache/2300.txt ./txt/2300.txt