It describes a little rabbit who saw a newly grown mushroom on the roadside and wanted to pick it but was stopped by his mother. Popular science
The little pig also saw it and wanted to pick the mushroom, but was stopped by his mother.
The little wolf also saw the mushroom and wanted to pick it, but his mother did not stop him and watched him quietly picking the mushroom.
Afterwards, the little rabbit was fine, and so was the piglet. The little wolf was poisoned after eating poisonous mushrooms and was admitted to the hospital.
Intention: The whole story tells us that we should not eat or pick random things on the roadside.