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Our nucleic acid recovery techinques found a great deal of homo sapiens DNA incorporated into the fossils, particularly the ones containing high levels of resin, leading to the theory that these dinosaurs preyed on the once-dominant primates.
Transcript:
[Three squid-like aliens in a classroom; one alien stands in front of a board covered with minute text and a drawing of a T-Rex skeleton. Two aliens sit on stools watching the teacher alien. The teacher alien on the left is on a raised platform and points at the board with one tentacle.]
Left alien: Species such as triceratops and tyrannosaurus became more rare after the Cretaceous, but they survived to flourish in the late Cenozoic, 66 million years later.
Left alien: Many complete skeletons have been discovered from this era.
[Caption below the panel:]
It's going to be really funny when our museums get buried in sediment.
https://www.xkcd.com/2990/
explainxkcd.com for #2990
They lived together in harmony with other large dinosaurs inside large structures.