Naturhistorical Museum Liege

On our visit of the Aquarium we visited the collection of the natural history of the university of Liege situated in the same building. My first contact with the bones of the elephant and the dinosaurs found in the Maas valley the area I live now.
Wy have the elephant this whole in his forehead?
The evolution is more obvious when you have all specimens in a row.
In my study time we had the human skeleton to learn.
Since this time I never have been in a museum like this.
What goes under the skin or feathers.
At last we are working a side of the Maas river.