Dinosaur-mad children are costing a dinosaur park in Wales more than £100,000 by spotting mistakes in the displays.
That's how much it is costing bosses to buy new plants and consult dinosaur experts about putting things right.
Plants flown in from around the world
The people in charge of the Dan-yr-Ogof Cave Complex and Dinosaur Park, in Abercrave, south Wales are flying in plants from around the world to keep the children happy.
They claim it's five-year-olds who spot the most mistakes, perhaps inspired by TV programs and films like Walking With Dinosaurs and Jurassic Park.
They compare the displays with exercise books on school trips, and have pointed out that some of the plants don't look like the ones that lived in the dinosaurs time.
The children have also noted that the way the dinosaurs are positioned is sometimes wrong, because they don't reflect current thinking that dinosaurs were quick moving and athletic..