Mary Roberts akabereka vaviri vaviri paBeaumaris Zoo iyo yaakatumidza kuti Billy naTruganini muna 1913. Zvisinei, kunyangwe akakurudzirwa kubvisa Billy, Roberts akawana Truganini achinetseka nekusavapo kwake, ndokudzoka kwaari. Chirimwa chekutanga chaifungidzirwa kuti chakadyiwa naBilly, asi chirimwa chechipiri muna 1914 chakapona mushure mekubviswa kwaBilly. Roberts akanyora chinyorwa chekuchengetedza nekubereka madhimoni eLondon Zoological Society. Pakazosvika 1934, kunyangwe kubereka kwakanaka kwadhiabhori kwaive kushoma. Mukudzidza kwekukura kwevadiki madhimoni muhusungwa, mamwe matanho ekuvandudza aive akasiyana zvakanyanya kubva kune akataurwa naGuiler.
mana