Brontotheres

the brontotheres are an extinct family of perisodactyls. they were preyed upon by creodonts like megistotherium and sarkastodon and mesonychian mammals like andrewsarchus and mongolestes with modern carnivoran mammals like nimravids and amphicyonids along with crocodiles and giant carnivorous birds and arcticyonid mammals and entelodont mammals like archeotherium. it behaved like rhinos agressive and territorial. it was not that bright and lived in herds to protect itself. it would charge at any animal it saw as a threat.