astronomy-to-zoology:

Genus: Paraceratherium

Also known as Indricotherium or Baluchitherium, Paraceratherium is an extinct genus of gigantic mammals related to rhinoceroses that lived in Eurasia during the Oligocene epoch. Paraceratherium is widely regarded as one of the largest land mammals known with individuals towering at 16 feet tall and 26 feet long! Like its modern counterparts Paraceratherium was a grazer and likely fed on leaves, using its downward pointing tusks and prehensile upper lip to rip them off tall trees. 

Phylogeny

Animalia-Chordata-Mammalia-Perissodactyla-Hyracodontidae-Indricotheriinae-Paraceratherium

Images: asecic.org and Ryan Somma