    4: Kempenaers    jentence  sare still '    aid same specie:  faithful , notably swans and |  ea. birds such |'as. the  Ibatross -» which mate: for  life and-are never unfaithful    o their partners: |  2: Kempenaers    aid. fidelity. still: exists in  species - + notably  birds such. as  ate for    jentence.    ome  wans and sea  he albatross. that m