Here is a picture of several slugs and one isopod feeding on a slice of stale bread discarded in the backyard several nights ago following a rainstorm.
The slugs were probably Arion subfuscus, while the isopod may have been Philoscia muscorum. Meanwhile, a Limax maximus was making a meal of another piece of bread.
This is one way to get rid of the kitchen waste. But disposal via gastropods is slow; several days later today, the bread slices were still there with only small chunks missing.