"Forward Curving Horned Bison Lizard"
Length: 6m (19.8ft)
Weight: 1.8 tonnes (2 tons)
Location: Montana, USA
Era: Campanian age, upper Cretaceous (74 million years ago)
The initial discovery of Einiosaurus was a massive bonebed filled with the disarticulated remains of hundreds of individuals of various ages, found together with varying underwater invertebrates, suggesting that it may have been a herd of animals that was killed in a catastrophic flood.