Description: The Aphrophoridae or spittlebugs are a family of insects belonging to the order Hemiptera. There are at least 160 genera and 990 described species in Aphrophoridae. (Wikipedia) I didn't know exactly what I had found at first. As it turns out, the spittlebug nymphs, immersed in the foam, create it as they suck the sap from the tree, and the foam acts to protect the nymphs from adverse weather, dehydration and predation. Spittlebugs, also known as froghoppers, can be found on a broad range of garden plants, but are most often seen on native species including wattles, eucalypts and casuarinas. They will feed on the leaves, twigs, branches and/or trunk of the host trees, and lay their eggs in the plant tissue. Adults are also strong jumpers!