Hard to pick one. Mechanics of nectar-feeding, info on torpor, feeding in bark-holes made by sapsuckers, and lack of paternal care - all stand out. Also the large diversity of hummingbirds, and contrast of diversity here (eastern US) with e.g. Columbia.

And I thought I knew alot about hummingbirds.  This course was a mind blower and eye opener for me.  So much new information.  I've learned so much about them from this fun and exciting course.  One of most memorable piece was learning to better use my Merlin App.  Thank you so much.

I was not aware at the sheer number of hummingbird species, and that most of them were non-migratory, spending their lives in Tropical Climates. Hummingbirds are so diverse int heir colors, tails, head-crests, and even their beaks. Once you spend time looking at them, you can really see all of the variety! I will definitely look into placing a hummingbird feeder in my yard to allow for my local hummingbirds a place to feed!

Very interesting course. I have taken several courses from this Cornell site. Enjoyed them all.     The hummer that could lower it's body temp. to 38 degrees F. Was not known to me before. The many hummingbirds that live in the Ande Mountains was also a new one on me.

The course was so interesting and fun! I learned so much! Learning all of the hummingbirds were in the America’s, that they could “hibernate” and get so cold, build stretchy nests and be so numerous and striking was so exciting. I am looking forward to another course. The depictions in art were interesting too and the fact that they collected and killed so many during that feather craze was new to me but important to know. Amazing that the feathers in the painting were still shiny after hundreds of years! Their migration patterns and songs were interesting too. Thank you for producing such a fabulous class!

I was most impressed with the migration maps drawn from ebird data! Fantastic! It is something I will refer back to. Every year I keep track of when I see the first and last hummingbird in my area (southeastern Pennsylvania). I try to have nectar feeders out and appropriate plants in bloom. This year my columbine was in bloom in early May when the ruby throated hummingbirds returned.  We are currently in the midst of a severe drought, and though I am watering my garden, I do not have much natural food for the hummingbirds. I hope I will have enough natural food sources for fall!

There have been so many memorable things I have learned in this course that it is hard to choose my favorite. I have enjoyed learning the mechanics of how hummingbirds fly, the science of torpor, and hummingbirds in art just to name a few. However, what I have enjoyed the most is that I am excited to share what I have learned in this class with others to help them enjoy these magical birds as much as I do.