It was a long summer where I live in Argentina. The hummingbirds visit me every year here for your winter. This year they stayed a little longer then usual. Maybe because it was such a cold snowy winter in the US. Take heart they will be back I am sure.
The last 3 years they have nested here and their babies grow strong on the feeders I have out every year. I found one of their nests after they left last year. It was no bigger then a tablespoon and long and narrow. I could fit the end of my thumb inside the nest. It is true what I heard, they do use spider silk to strengthen the nest. Amazing birds they are and so beautiful.