2 Dinosaurs & a Pterosaur of Southeast Asia

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Today's drawing is of Mesozoic animals that lived in Southeast Asia.

2 Dinosaurs & a Pterosaur of Southeast Asia

These four animals lived in what is now Southeast Asia during the Cretaceous Period.  All were found in Thailand and probably existed in nearby countries like Vietnam. Vietnam has a lot of Cretaceous Period rock that shows that dinosaur ecosystems existed there. 

In the foreground is Siamosaurus suteethorni. It was a medium-sized Spinosaur from what is now Thailand. It was somewhere between 17 and 30 feet long. That is around 5-9 meters long. It is known only from teeth, so this drawing is based on other Spinosaurs found in other parts of the world, like Baryonyx. Spinosaur teeth are very conical and were used for spearing fish. So here Siamosaurus is seen about to spear a sawfish with its long, straight teeth. Siamosaurus may also have fed on Pterosaurs when it could catch them off guard. 

Far off in the background, you see a Titanosaur. This is Phuwiangosaurus sirindhornae... a medium-sized Sauropod. It was around 50 feet and possibly up to 65 feet long.  That is 15 to 20 meters long. It fed on plants and was possibly the largest animal in the ecosystem. The local Spinosaurs would have left a full-grown, healthy Phuwiangosaurus alone. Besides, it appears all Spinosaurs fed more on fish than large dinosaurs. Although there is evidence (as mentioned above) that Spinosaurs may have fed on Pterosaurs occasionally. 

The Pterosaurs seen in the sky are Garudapterus buffetauti. This flying reptile is NOT a dinosaur, but it lived with dinosaurs in the Mesozoic Era - including the Cretaceous Period. Garudapterus was a smaller type of Pterosaur. But it was not tiny either. It had a wingspan of about 8 feet or 2.5 meters wide. Like the Spinosaurs, it was primarily a piscivore or fish-eater. 

NOTE: This drawing or coloring page is found in printable form by clicking on the button labeled "Paleontology." Then scroll down to the bottom of the "Mesozoic Life" part of the list. If you are accessing this page in February 2026, then you will find this coloring page at that part of the list. New drawings are placed at the bottom of the correct list.