The small, spindly green plant in the centre foreground is a young broad-leaved Acacia pycnantha, which has a colony of the Fiery Jewel living on it.

The brown leaves are where the larvae have eaten and caused the leaves to die and turn brown. There is an ant byre at the base of the plant.

Numerous Papyrius ants attending a group of night feeding larvae on Acacia leiophylla

Immature larva being attended to by Papyrius ants.
Ants are 4 mm long.

Mature larvae,
head on right

Mature larvae which have been feeding on leaves of a broad leaved Acacia.
They have eaten the cuticle off the leaf surface causing the sub-cuticle area
to die and turn brown.