Add Insect class.
Revert "Add Insect class."

This reverts commit 9d8d39d08edff8720db9fbfb4262c5bb6263c01c.
Revert "Revert "Add Insect class.""

This reverts commit 6885d3963d7c377154d9b1dd55f79e600f19b7b6.