A while ago I observed an interaction between a Koala and a small flock of Sulphur Crested Cockatoos that Ive never seen or heard of before.
These Cockatoos were bullying or definately harassing this Koala. It went on for more than an hour. The Koala tried to get away, moving up into the canopy of this Long leaf box, but had little room to move.
I concluded that it was a flock of rascals, maybe young Cockatoos, maybe not, at a loose end and flexing their intellectual superiority over this creature.