Who is responsible for the disappearance of the milk in the animal farm?

In George Orwell's "Animal Farm," the pigs, particularly Napoleon and Squealer, are responsible for the disappearance of the milk. They take the milk for themselves, justifying their actions by claiming that it is essential for their health and leadership. This manipulation of resources highlights the growing inequality and corruption among the animals as the pigs begin to adopt the behaviors of the humans they initially overthrew.