Finches can be hard to keep going. Especially the smaller varieties. Zebra finches are pretty hearty and much easier to take care of. Also be careful of cleaning products anything that contains amonia or bleach like widow cleaners and polishes. Could be food like others have suggested. Age is a problem with these birds. Especially if you got them from a pet store where they are not getting birds from breeders. If weather permits clean the cages outside and rise thoroughly so it can air out before you bring it back inside.
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