Did you know feather bonus is based on luck?
Yeah, yesterday I leveled up Stella and was looking forward to the feather bonus... nope, nothing appeared.
I contacted Rovio because I thought this was a bug/glitch or whatever. They answered me this:
Please be kindly informed that the Feather Bonus is not guaranteed to appear every time and whether it does is luck based.
When you level up a bird, if you are lucky, you’ll receive the Feather Bonus, which will give you the chance to earn extra feathers for that bird. The first pick is free and if you want to get even more feathers, you can pay extra gems to pick more cards.
I have to ask this: did you know that? Did I miss that information somewhere?
I was kinda annoyed by the fact, that I didn't get the feather bonus. I paid some gems to pick more cards from one chest because there were 15.000 Stella feathers in there, thinking once I level up and get lucky I might even level up twice in a row. Nope...