What species is the feather from?

August’s competition: which species?
You don’t know? Well, enter the competition and you’ll see that there are only four options, so it’s easier than you might think. What’s more it’s completely free, and you can win some great prizes! And if you convince someone else to enter you get another go. All correct answers enter the draw for prizes.
Click on this link to enter:
https://www.birdinginspain.com/bis-competition/participate/
So far, the voting is as follows:

Great Bustard leads the voting in the BIS competition, with 57%
- Great Bustard leads with 57%

Hoopoe is in second position with 32% of the votes in the BIS competition
- Next is Hoopoe with 32%
Outsiders are Common Snipe and Barn Owl, with 6% and 5% repectively.
Good luck!