8 ▁and ▁had ▁three ▁children ▁before ▁divor cing ▁in ▁ 1 9 4 7 . ▁ ▁From ▁ 1 9 4 2 ▁she ▁lived ▁at ▁Cal ound ra ▁on ▁the ▁Sun sh ine ▁Coast ▁of ▁Queensland . ▁ ▁The ▁environmental ▁activ ist ▁Mc Ar thur ▁was ▁a ▁strong ▁environmental ist ▁and ▁a ▁co - found er , ▁with ▁Jud ith ▁Wright , ▁David ▁Fle ay ▁and ▁Brian ▁Cl ou ston , ▁of ▁the ▁Wild life ▁Pres ervation ▁Society ▁of ▁Queensland ▁in ▁ 1 9 6 2 , ▁and ▁served ▁as ▁vice - pres ident ▁from ▁then ▁until ▁ 1 9 6 5 . ▁ ▁In ▁ 1 9 6 3 ▁she ▁founded ▁the ▁Cal ound ra ▁branch ▁of ▁the ▁society . ▁ ▁She ▁was ▁involved ▁in ▁several ▁campaign s ▁during ▁the ▁ 1 9 6 0 s ▁and ▁ 1 9 7 0 s ▁to ▁preserve ▁land sc apes ▁threatened ▁by ▁economic ▁development , ▁including ▁the ▁P um ic estone ▁Pass age , ▁the ▁Great ▁Bar rier ▁Re ef ▁and ▁C ool ool a . ▁ ▁Much ▁campaign ▁work ▁was ▁fund ed ▁through ▁her ▁growing ▁and ▁s elling ▁native ▁plants ▁as ▁well ▁as ▁through ▁exhib itions ▁of ▁her ▁wild flow er ▁paint ings . ▁ ▁She ▁was ▁especially ▁concerned ▁for ▁the ▁Wall um ▁country ▁of ▁south - e astern ▁Queensland , ▁a ▁habitat ▁character ised ▁by ▁flor ist ically - rich ▁coast al ▁he ath ▁and ▁sw amps ▁on ▁deep ▁sand y ▁so ils . ▁ ▁The ▁sp ider , ▁O z ic