ground sloth: gigantic extinct terrestrial sloth-like mammal of the Pliocene and Pleistocene in America
mammal: any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
monophysitism: a Christian heresy of the 5th and 6th centuries that challenged the orthodox definition of the two natures (human and divine) in Jesus and instead believed there was a single divine nature