Here are research of tyrannosaurs made in the year of 2003. Tyrannosaurs are one of the most studied dinosaurs and new research, and taxa are made almost every year.
- Aviatyrannis-Aviatyrannis is one of the smallest tyrannosaurs. It is known for fossils in Portugal. It was a cousin to Stokesosaurus.
Aviatyrannis was a close cousin to Stokeosaurus.
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