👉 Shrills are a type of musical sound produced by the hoot of birds, particularly robins and sparrows. They are often heard in nature during the day as they fly from tree to tree for food, or when they sing songs or make other sounds. Shrills can be loud and clear, but also have a harsh and piercing quality that can cause discomfort if you are close to them. They are typically used by birds to communicate with each other or to attract mates, and they