Sydney has been grooming my left ear as if to say “thank you”. Really does seem better. He’s also back to squabbling with the other birds instead of retreating from all confrontation. I’m hoping it was just a passing thing but we’ll keep an eye on him a bit longer.
I know we’re supposed to isolate a sick bird, but the other two had already been thoroughly exposed and separation from the flock is also very stressful. A judgment call.