Rainbow feathers are a type of reward that lets you choose which bird you want to give feathers to.
When you win this kind of feather, you'll get a popup asking you to choose the bird that will receive the feathers, tap on it, and that's it!
Please note that you can only choose one bird to give the feathers each time you get this kind of reward. This means you can't divide them into different birds but you can choose different birds each time you win these feathers.
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