None of our eucalypts flower every year. I have yet to find out, but maybe every 5 or 10 years or in the case of the grey box, every 200 years probably. There is a hive in a friend's grey box tree, so bees must like them for something! It was funny the day we found the hive. I was looking for what trees had flowers to see whether to take hives there. My mate stayed on the bike while I looked round a couple of trees. The first he gently told me there was a snake hanging down near my ear, and the second, he saw had a beehive in it.
Best not to mention flying fox round here. The dirty smelly diseased #$%$@#%! Anyway, we have about a million big black ones and little red ones in town and they have taken to feeding here at night.