This is the Elasmotherium, a huge, hairy unicorn that existed 30,000 years ago. Unsure if it's recognized, but the "No Internet" Dino is wearing a birthday hat to celebrate its 10th birthday.

Meet the Elasmotherium, a big hairy unicorn that existed as early as 29,000 years ago Elasmotherium ("Thin Plate Beast"), also known as the Siberian Unicorn is an extinct genus of rhinoceros