Bayanin: An gano burbushin burbushin tururuwa guda biyu ne kawai. Marigayi J. Alan Holman, masanin ilimin halittu da masanin ilimin halittu, ya fara gano burbushin tururuwa na tururuwa a cikin Cumberland Cave, Maryland (kusa da Corriganville), wanda ke da shekaru Irvingtonian (daga miliyan 1.8 zuwa shekaru 300,000 da suka gabata). Na biyu shine ganowa na Rancholabrean (tsakanin shekaru 300,000 zuwa 11,000 da suka gabata) ɓangarorin ɓoye a cikin Giant Cement Quarry a South Carolina (kusa da Harleyville), ta Bentely da Knight a 1998.Karyotype na tururuwa yana kunshe da chromosomes 50. Tambaya: Waɗanne sunaye biyu ne Alan Holman ya riƙe?
masanin ilimin halittu da masanin ilimin halittu