I roto i te 1992, ka mau Rasmussen te tūranga o te kaiawhina ki S. Dillon Ripley, te hēkeretari o mua o te Smithsonian, i te whakamahere ki te whakaputa i te aratohu tino ki te manu o Āhia ki te Tonga. ka mate ia i muri tata i te tīmatanga o te kaupapa, Rasmussen tangohia ake te kaupapa, me te kaitoi John C. Anderton, whakaputaina Manu o Āhia ki te Tonga: Ko te Ripley Guide, he aratohu manu rua rōrahi mo te Indian subcontinent i te aratohu mara tuatahi mo te rohe ki te whakauru i sonograms. Kei roto i te rōrahi 1 te aratohu mara ki runga i 3400 whakaahua i roto i 180 papa, me te neke atu i te 1450 mahere tae. rōrahi 2 (Ahu me te) Status homai mehua tauira, e pā ana ki te tuakiri, te mana horahanga, me ngā tikanga. whakaahuatia Vocalizations i pūkete, me te reira e neke atu i te 1000 sonagrams.1508 momo i puta i roto i Āhia ki te Tonga
Ko Assam, Arunachal Pradesh, Bangladesh me Afghanistan