A footprint belonging to a 20-foot-long carnivorous theropod dinosaur that walked around on its hind legs has been discovered in Thailand.

Pichai Prathetsena was visiting Phu Phra Bat National Park with his family when he spotted the unusual marks while exploring a stream.

He took a photo of them and uploaded it to a Thai Facebook page called “What is this creature?” The Thai government saw Prathetsena’s post and contacted him.

This week, the Department of Mineral Resources visited the location and discovered six dinosaur footprints dating back 120 million years.

The three-toed footprints measure 11 inches (29 centimeters) long and 10 inches (26 centimeters) wide.…