Hetty, the mulch is heaven on earth for all kinds of critters. I just took a brom out of a pot of the stuff and it was full of little white worms of some kind. I guess they are all working on converting the mulch back to nothing. The ants are everywwhere. Just cut all the dead branches and leaves out of my screw pine palm and it was full of animal life up there. Ants, frogs, bees you name it. I sealed the cuts where I cut the frozen branches off. Maybe some new growth will emerge next year. That is if we have a warm winter.
The broms seem to like the mulch regardless of the other life forms.