I wonder if anyone can help me...
For the past year my male zebra finch has been breathing through his mouth. He doesn't continuously do this but most of the time he does. When he breathes I can hear a faint clicking sound. He has also lost his ability to sing loudly. He'll whistle but it'll sound a bit croaky.
He's been treated for mites. He eats and drinks fine and hops about and still has lots of energy. His breathing problem hasn't got any worse or better since it started. I've taken him to the vets but she wasn't sure what to advise so she gave me the number of a bird expert and he said that, if the finch is still energetic, there's nothing to worry about...

If anyone can offer me any advise on what this might be or how I can help my little finch, I'd really appreciate it.
Thanks,
Cassie