The article discusses the study on the evolutionary history of various mammalian groups including the Haramiyida and Megaconus. It states that the Haramiyida, a short-faced omnivore or herbivore adapated life in the trees and has originated at least 215 million years ago. It also mentions that the Megaconus adapts a terrestrial life and plant-based diet and has 41 percent of anatomical characters.