The Descent of Man and Selection in Relation to Sex: Volume 1

according acquired action advantage apes appear beautiful become believe belonging birds birth body breeds butterflies causes certain characters civilised closely colour common complex conclusion developed distinct domestic doubt early effects equal evidence existence extremely fact faculties feel females follow give given greater habits hair hand head higher highly horns important increase individuals inhabitants inherited insects instance instincts kind known larger latter lead least less live lower animals males mammals manner means mental mind modified monkeys moral namely natural selection never observed occur offspring organs origin period placed points possess present probably produced progenitors proportion protection races reason relation remain remarks resemble respect result savages seems seen sense sexes sexual selection shewn social sometimes species structure successive surface transmitted tribe variability variations various whilst whole wings young