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
differential calculus: the part of calculus that deals with the variation of a function with respect to changes in the independent variable (or variables) by means of the concepts of derivative and differential