A crustacean of the order Isopoda, such as a woodlouse.
The little pill bug rolled itself into a safe ball when Johnny picked it up off the fall leaf. He didn’t know it was an isopod until he studied invertebrates in college.
Pill bugs and other similar isopods can be easily found in fallen leaves and rotting logs in the woods or even back yards. They are one of the “bugs” which kids typically get to know by sight, though they may not learn much about them until they study invertebrate zoology. Sadly, by then, some of the pure fun of seeing the critters in nature has been forgotten.