A colorful hollow tube from a Stonefly larva (Order Trichoptera)   Stonefly larvae use a special glue to make a protective tube out of sand, pebbles, plant matter or other debris and carries the tube around like a hermit crab; The macro-invertebrate diversity of the Flathead River and its tributaries is remarkably extensive and an indicator of the excellent water quality of this river system.  &nbsp;ILCP RAVE; Flathead River Valley, British Columbia, Canada.  &copy; Michael Ready