Congrats to Kevin Howk who solved this week's HDYK? in about 9 minutes!
The final answer was:
The only aves that can use their wings to fly in reverse are: hummingbirds
I would have taken backwards for "in reverse" as well as Trochilidae for hummingbirds, but the facts remain the same.
Here's Kevin's logic as well as his answers from the rest of the week:
Monday: All played in reverse
* We Will Rock You, Queen, 1977
* When Doves Cry, Prince,1984
* Vogue, Madonna, 1990
* Don't Stop Believing,... READ ON