Most birds love to bathe, but some can be reluctant to bathe when housed in a small cage. The bigger their home and the more companions that they live with seem to have an impact on their bathing habits. In watching my own flock, I believe they feel safer in numbers. There is always a “look-out” bird that remains on a high perch while the others go down to bathe. If the look-out spots anything that threatens danger it will let out a warning call and the flock will retreat to the high perches. Without the look-out, it appears that some finches will not bathe. This may be why your birds won’t bathe.
What do I do if my birds won’t bathe?