Question
Why is the droppings of birds whose meat is eaten considered a major impurity, while the droppings of birds whose meat is not eaten considered a minor impurity?
Answer
I say, and with God's help: This is based on necessity. What is affected by necessity lightens the impurity, and what is not affected by necessity remains severe. It has been lightened in the case of animals whose flesh is not eaten because it is impossible to avoid them, while we find other flying birds like pigeons and sparrows whose droppings are originally excused due to hardship and necessity. And God knows best.