没有必要找这些例子。你见到就会明白。英语中有些名词是分性别的，如boy/girl, man/woman, sir/madam, chairman/chairwoman, speaksman/speakeswoman, waitor/waitress, actor/actress, landlord/landlady, host/hostess, horse/hare, bull/cow, tiger/tigress, lion/lioness，dog/bitch, stag/deer, cock/hen, father/mother, gay/lesbian, dad/mom等等。但多数动物的名称没有性别的区分，这时如果需要区分性别，可以在名词前加male,female或者通过he-, she-构成合成词。如she-wolf没必要去记忆。现在有she-man，指泰国的人妖。