I want to add that you may have no idea where those tree branches have been; humans may have sprayed them with chemicals or they may have traces of pollutants on them. If you use natural branches for perches, be sure to clean them with a good, bird-safe disinfectant before giving them to your birds.
I am not a vet or a bird expert
. I do work at a bird rescue, but that doesn't mean that I'm always right. This is just my opinion
based off of my work at the rescue, general bird knowledge, research, and personal experience.
Max, Shih Tzu/standard poodle/mystery mix, 1 yr old (service dog in training)
Kirby, pied cockatiel, ~5yrs old
thank you, Calitiels, for the signature!