Triceratops horridus

As a large herd of ceratopsians amble across a vast open stretch of
Cretaceous North America, we are witness to a symbiotic relationship
between these dinosaurs and Enantiornithine birds. The painting
illustrates birds assisting in removal of annoying parasites from
reptilian skin, insects kicked up in the dust from passing herds. By
eating the insects, the birds are provided a bountiful meal and in
exchange the ceratopsians are no longer unwilling "hosts" to their
unwanted 6 legged, travelling companions.