Once the weather begins to get warmer and the top soil thaws, the hypolithic animals return from their undisclosed winter hideouts to the undersides of the rocks. They are still hidden most of the time, but one can now find them easily by overturning rocks. About a week ago, a couple of large rocks in the backyard, when overturned, displayed their menagerie of arthropods.
Swarms of ants and isopods, apparently tolerating each other well, were underneath both rocks. A detailed look at the clusters of ants revealed many eggs or larvae being transported.
Detailed looks at other spots under the same rocks also revealed several millipedes or millipede-like creatures among the ants and the isopods.
I hadn't noticed them while taking pictures. Obviously, the ants are leaving alone the isopods and the millipedes.
Absent were snails and slugs. Although slugs and isopods tolerate each other, I don't know if ants and gastropods are ever found together in large numbers.