I have a rooster kept near house that has learned how to knock feed buckets over. He seems to have learned how to do it by accident by trying to get into almost empty buckets. Now he can tip buckets nearly 1/3 full and then calls hens and young over to cherry-pick / loot the contents. His mother has already displayed the ability to knock meal worm containers from my hands so she does not have to drop meal worms down to her chicks one at a time.