Mary Roberts haifa biyu a Beaumaris Zoo wanda ta mai suna Billy da Truganini a 1913. Duk da haka, ko da yake shawara don cire Billy, Roberts samu Truganini ma baƙin ciki da rashi, kuma ya mayar da shi. Na farko litter aka zaci ci da Billy, amma a karo na biyu litter a 1914 tsira bayan Billy aka cire. Roberts ya rubuta wani labarin a kan rike da kiwon da aljannu ga London Zoological Society. By 1934, ko da nasara kiwon da aljannu ya rare. A wani binciken a kan ci gaban da matasa aljannu a bauta, wasu ci gaban matakai kasance daban-daban daga waɗanda ruwaito da Guiler.
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