That loud noise you're hearing in the Hudson Valley right now isn't from crickets, but a bug with a painful bite that you'll probably never see. Carl Court, Getty Images Carl Court, Getty ImagesAs soon as August rolls around, the Hudson Valley begins to look and sound very different. August is also peak season for katydids, bright green insects that spend their days hidden among leaves before filling the night with one of the loudest sounds of summer. Their wings look almost identical to green leaves, complete with vein-like patterns, allowing them to disappear into the tree canopy. Katydids also play an important role in the Hudson Valley ecosystem.