Siamotyannus was one of the carnivore in 110 million years that ruled the land is now called "Thailand". It was considered one of T.rex's cousin that you never heard.
Siamotyannus was only 25ft (7.6m) or about the half of T.Rex's size, which was also lived in the Early Cretacous period. Siamotyrannus's fossils were found mostly in Khon Kaen, Kalasin, Chaiyaphum, and other provinces of North-East of Thailand. This carnivore was mostly the most common carnivore to ruled Thailand. The other predators that shared the same habitat like Siamosaurus Suteethorni and Gallimimus that ruled the same region.
This carnivores' prey were mostly sauropods, hadrosaurs,iguanodonts,and ceratopsian that lived the same era. If you want to know more information about this carnivore read "Scholastic Dinosaurs A to Z" ,2003, by Don Lessem. This book will provides you more about Siamotyrannus.