Every spring, many things like caterpillars fall down. what kind of tree is it?

Poplar and willow have caterpillar-like seeds that spread with the wind, but there will be many poplar seeds, and because poplars grow taller and float farther, it seems that there won't be many willow seeds floating outside, unless the willow is not in the forest, and if you are far away from the willow, you may not notice them.