They have evolved beyond mere walking.
If they walked they wouldn't be as cool
cuz they r always in a joy mood........
They are unable to move their feet independently so that is the reason they hop.
A mere 1 million years ago this marsupial lived in africa.
at that time the african peninsula was home to erratic volcanoes.
as it happened the roos lived awfully close.
--figure the rest out for yourself. i aint your personal david attenborough.