A 'pod' with 4 long horns attached to branches of (what I think is ) a Blue Box Gum. They varied in size but the smallest was roughly 4 cms long from tip of horn to branch attachment. There seemed to be a small hole in the bottom, between the horns. I am assuming that this is an insect home but it might be part of the tree. The pods were the same colour of the thin branch it was connected to and tough.