I found a website that has looked at the bird migration in each region of the United States and is tracking their movements. For each region, they have multiple charts with specific birds to see which ones have been moving more in the past week, and which ones have been moving less in the past week. It would be cool to go on this website for a whole year and see what birds migrate at different times, and how consistent this timing is over the years. There is also an animation that basically shows bird migration over the past few months.
Within this website, there is an interesting link that further expand upon bird migration. This link defines each region (i.e., what states are in each region), and then talks about when they would expect bird migration. It talks about when you would expect the species to arrive first, then when the number of birds arriving would begin to increase rapidly, when the number would peak, when they would start to leave, and when the final bird would leave. This website is relatively new (created in 2015), so I’m not entirely sure how accurate these predictions would be, but nonetheless it is still interesting.