I’m looking for a list of what birds migrate from where to where at what times. Preferably over North America, but the rest of the world is good too.
For North America you are talking about hundreds of species, and for the world several thousand. Each has its own characteristic migratory route and migration period. It would be difficult to present such complex information in summary form.
This National Geographic Map shows many of the major routes for North America.
Can you narrow your question down a bit?
No, I think the National Geographic Map will be the best I can get easily. More than that isn’t really worth the trouble. (Though if you want to find more, I wouldn’t object)
Thanks.