For more than 20 years, a simple white slab sat in the main office of Biloela State High School, blending into the background. It was a relic of the nearby Callide Mine, a gift to the school by a geologist. For most, it was just an impressive rock with multiple chicken-like tracks.

A large boulder used as decoration in a rural Australian high school’s foyer is actually covered in dinosaur footprints —it just took around 20 years for anyone to notice. After examining the ancient rock,

Dozens of dinosaur footprints embedded in a boulder were found hiding in plain sight at an Australian school, according to researchers.