Yes the 'Bell' or Dewlap being inflated at night with Helium from the Rumen and used to facilitate migratory flights. As these migrations take place only on very dark nights - the moose climbing to high ground in preparation, film footage is rare. The attached link however shows a disguised moose inflating it's bell-sack and escaping a Zoo complete with 'water landing'
https://www.youtube.com/watch?v=dApRtXZRw1Y
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