BHP Group BHP.AX, Rio Tinto RIO.AX and Fortescue Metals FMG.AX slid 0.1%-1.7%. Feb 22 (Reuters) - Australian shares on Wednesday fell for a second straight session, touching their lowest in more than a month, as rate hike worries by major central banks diminished investors' risk appetite. Australia's central bank on Tuesday signalled more rate hikes would be needed in the months ahead, after it abandoned all thoughts of pausing due to worries around sticky inflation.