Crimson Peak. Guillermo del Toro, 2015.
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Edition screened: Universal Blu-ray, released 2016. English language. Runtime approximately 119 minutes.
Summary: Butterfly mortality.
Details:
1) A cluster of dead and dying butterflies is found. One is placed at an ant colony at 25:00, with close-ups of the ants attacking it through 25:16.
2) A few images of butterflies pinned to specimen boards, scattered throughout the film.