I had a very large model railroad in the garage. It represented the Central Coast of California circa 1960, on the Southern Pacific Lines.
One of the signature trains that operated over those rails were enormous, slow moving mile long trains of open gondolas filled with sugar beets. Big suckers, like withered footballs.
How to make millions of 1/160 scale roots? It sounded like a neat trick- buy a five pound bag of carraway seeds and dump them into the open cars, then fix with dilute white glue. It all looked great.
Then the mice found a yard full of those trains. Just tore the whole thing to pieces. Cars, locomotives, buildings, signals, overhead wires, all trashed.
And they left their droppings.