TOP
With his son Tyson at his
side, Maralngurra talks
with archaeologist Ches-
ter Clarke about clearing
brush from rock art sites
to protect ancient paint-
ings from being burned.BOTTOM
A helicopter guided
by Terrah Guymala, a
Warddeken ranger, drops
incendiary devices that
slowly react chemically
and then ignite after
they are on the ground.88 NATIONAL GEOGRAPHIC