I've got a female zebra finch, who seems to have lost her voice. She looks like she's either gasping or coughing jerkily several times in a row with her head tilted back (I can't tell which because there's no sound), and then looks like she's calling furiously, but all we can hear is a slight clicking noise, like someone tapping on plastic. She hasn't been as active as usual, mostly sitting with her eyes shut and her feathers a bit fluffed while repeatedly doing her cough / gasp. I've seen her fly to get water and food though, and if she knows someone is watching her she keeps an eye on them. What's wrong with her, and what should I do? I have some human antibiotics, but I'm uncertain whether they're ok for my bird.
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