Trigonias

Trigonias (Greek: "triangular" (trigonos), "ias" [denotes possession] ) is an extinct genus of rhinocerotid from the late Eocene (Chadronian) some 35 million years ago of North America. Trigonias was about 2.1 m long and, despite lacking horns, looked a lot like modern rhinos. Its front legs had five toes (as contrasted with three in modern rhinos), the fifth of which was vestigial.

A specimen of T. osborni was estimated to have a weight of about 391 kg.