Movie 1.

Acherontia atropos: X-ray video of metathoracic-abdominal air sacs. Protractions of the mesophragma by DLM flight muscles generating volume changes of air sacs, visualised by consecutive radiographs 172 – 233 out of 300 exposures during 5 min (see Materials and Methods), showing 10 protractions. 18 mb.