Here’s a photo Matt Wedel took in the Raymond Alf Museum in Claremont, California. The lined-up skulls belong (I think) to Megacerops, the large to very large Late Eocene brontothere previously known as Brontotherium. Like most other brontotheriine brontotheres it has reduced, globular upper incisors and is very wide at the back of the skull. The upper incisors were in fact so small that they might have been virtually useless, and these animals probably relied on a prehensile lip to gather food. Must stop there – want to start talking about horns and evidence for intraspecific combat, but this is a ‘picture of the day’ and I don’t have time.
By the way, I’m not really sure what ‘Freddie’ is. It looks like a rhino, possibly a hyracodontid. Does anyone know?
I’m not entirely sure why they decided to give the specimens pet names, but I will admit that it’s amusing.