Field Notes - I think this rather repugnant structure is the work of caterpillars. Most of these web funnel-shaped masses are about 10cm long but the one in the last photo is 2' top to bottom. Looks full of caterpillar castings.
mostly on acacia trees.
Field Notes - Four different bag-shelters of the processionary caterpillar on Acacia.
Sighting and photos (c) shineybeetleman.
Bag moth caterpillars, in a neatly woven silk bag at the base of a tree.
On an outer eucalypt branch at edge of bushland reserve.
In Acacia sp.
Not sure if correct ID, it was listed as closest ID option
Foaming looking clumps on base of tree trunk
Egg masses
Underneath a Cootamundra Wattle.
Caterpillar egg mass
3rd instar ground nest caterpillars making a nest on Acacia concurrens