Documentary.
"SDH subtitles (subtitles for the deaf and hard-of-hearing) are a function of the disc and serve the same purpose as closed-captions.
Originally produced as an episode of the television series: Nova.
Program content: ©2017.
Widescreen (16x9).
"Inspired by the book 'Animal weapons' by Douglas J. Emlen."
Running time indicated on container: approximately 60 minutes; program running time: 54 minutes.
Music, Paul Hartnoll.
Narrator, Eric Meyers.
DVD; Region 1, NTSC; widescreen presentation; stereo.
In English with optional English subtitles for the deaf and hard-of-hearing (SDH).
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