I want YOUR CASE - Bob Armstrong's Nature Alaska

https://vimeo.com/123903859

This video shows a Giant Case Maker larva caddisfly without a case driving one with a case out of its case and taking it over
Members of this family Phryganeidae typically fight over cases.
A larva removed from its case will quickly set to work constructing a new case with any suitable material available.
For more information on caddisflies look at Aquatic Insects in Alaska -- Major Groups and Caddisflies by John Hudson, Katherine Hocker, Robert H. Armstrong