Leaf miners leave a trail inside the leaves of trees and other plants. A mother insect will lay an egg under the skin of a leaf and the egg hatches. The larvae or baby is hungry so it eats the leaf. As the larvae grow, they eat bigger and bigger trails. As the leaves fall from the trees, check to see if you can find any leaf miners. Their trails sometimes have little black specks in them. This is frass or bug poop.
image from diggingredclay.com.
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