My sister has had a lot of problems with infertility and has pretty much given up on having a biological child of her own, but the cost of adoption is outrageous. Is there a simpler form of adoption where I or else someone could simply sign the parental rights over to my sister?

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I want to sell my parakeets and have noticed that other people who are selling parakeets ask for adoption fees of up to 60 $
Why? How can adoption fees ensure my bird will get to a good home?