I heard a song outside earlier today that was new for this season. It reminded me of the Baltimore Oriole song - strong and melodious - I could hear it even with all the windows closed. Robins can be loud like that, but it was louder than a robin. I couldn't see it to identify it, but it got me thinking about the appearance of our summer songbirds.
While searching for information about when to expect the orioles, I came upon this site: Journey North. Not only does it have a map for the orioles flight north, but also for hummingbirds, Monarch butterflies, Whooping cranes, singing frogs, as well as others.
Click on graphic to enlarge
I love the internet.