I loved learning about the different types of hummingbirds, also that they were only found in North and South America, I had no idea they were endemic to only this side of the world!
I was most surprised about the structure of their tongue, how its forked and wraps around their skull. I was only aware of woodpeckers having tongues that wrapped around their skulls.
We had a female Ana's Hummingbird make a nest in our courtyard for years and it was always fun seeing her year after year. Sometimes she would have two nests in a season! She'd always divebomb John, my second dad since he's taller than Mom and I, whenever he'd be heading to the front door, though.