Citipati.

It is noisy dinosaurs all the way down.
The last dinosaur has a name but our ears can not hear it, making it hard to know that which sustains everything.
Perhaps the world then was quiet and calm and lacked the raucous activity of animals thinking they lack something.*

ROAR reach out always really
* commonly expressed in the sparrows parable for worry-not. It seems to be a humanoid problem.

looks like all the short front armed dinos are meat eaters.
yikes! glad we don't hear any of their vocals now!?
interesting, thank you for posting~

That the T-Rex was a stealth hunter so you would never hear it until it was too late, if it roared, it was looking for a mate! Imagine being stuck in the Jurrasic Age with all these scary monsters roaming about!!