It may be inferred that the towering bipedal Thoriphants were a prehistoric species that moved north in reaction to invasion by humans.
Those that persisted were captured by humans and exploited as oxen for labor. Hence, they were called Adult Male because of their ability to carry heavy burden.
The theme of Mosley's movie is about how Humans tend to maltreat other species.
The movie is about a species of beings known as Thoriphants. When the oppression became too much, they rebelled against their life of servitude and find their way to the city of Uprights.
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