Birds know no borders. Many of the species that sing to us all summer have winter homes farther south in Central or South America. Some birds just pass through, and some settle in for the summer. Whatever their destination, May is a time of year where we can see many species in our parks. World Migratory Bird Day is a celebration of the diversity of birds that live among us, and a reminder of our ability to protect these animals as they travel extraordinary distances each year.