In 1936 about were set aside as a public reserve. In 1939 a koala enclosure was built by the Institute of Anatomy. The government acquired additional land to establish a national park and fauna reserve in 1962, extending the national park to . Tidbinbilla was later expanded again to its current size.
iN 1936 aboUt wERe set Aside As a puBlIc RESerVe. In 1939 a koAla eNclOsURE waS BUiLt by The InsTituTe Of AnatoMy. the GoVeRNMENt aCQUIreD aDditioNaL lAnD to eStabLiSh a natIonal pArk and FaUNA resErVe iN 1962, exTending ThE natIOnal pArk to . TIDBinBillA waS later ExpANdeD agaIn to ITS cURreNt sIze.