These birds are easy miss but they pass over me in huge numbers when I go up to visit my hawk banding friends in northern MN and when I do my surveys in southern MN. If you visit Cornell's All About Birds page for the pipit and scroll to sounds and listen for contact call, you may recognize it or you may find yourself noticing it when you are in open fields. It's a quiet, easy to miss call but it's kind of cool to know these birds are passing through incognito to most of the world.