Hummingbirds and Site Fidelity

What is meant by the term site fidelity?  According to the book Hummingbirds of North America by Sheri Williamson it means the following: "the tendency of birds to return to the same nesting, wintering, or migratory stopover locations each year." Page 240.

I do not know about you but I find it to be quite amazing that such a very tiny bird can fly well over a thousand miles each way during migration and the are still able to find the exact location where they spent the summer.  Talk about having a very precise internal radar or GPS system for lack of a better term.  This is just yet another of the many astounding facts about these birds that truly amazes me. 

I think that this is something about hummingbirds that my mom would have enjoyed discovering. Every time I make such a discovery I think of my mom and our shared love of hummingbirds and wish she were still alive today for me to inform her of the latestest discovery about hummingbirds that that I have made.   It is my hope that this will also enjoy making this discovery about hummingbirds.