Prehistoric Planet on Instagram: "The 🦖 Tyrannosaurus rex "Sue" was discovered on August 12, 1990, by fossil collector Susan "Sue" Hendrickson in South Dakota. Hendrickson found the large vertebrae of the T. rex embedded in a cliff face while prospecting with the Black Hills Institute. The discovery was significant as it was the largest and most complete T. rex fossil ever found, and a subsequent ownership dispute led to its auction in 1997, where it was purchased by the Field Museum for $8.4 m