Tree climbing isopods were featured on this blog before in this post.
Last Saturday night after a thunderstorm, I found 2 species of isopods on the trunk of a young apple tree in the backyard. One of them was Philoscia muscorum*.
And the other one was Armadillidium nasatum. Here are representatives of both species together after I brought them indoors for a closer look. Philoscia is on the left, Armadillidium is on the right.
Why do isopods climb trees? Probably they feed on the fungi that grow on tree trunks.
*My isopod identifications are always tentative, pending confirmation. So I could be wrong.