neurological damage

I have a pair of cockatiels. They are 1.5 or 2 years old now (approx because the guy i got them from did not know for sure). I have had them for 6 months. Daisy, the female, was extremely fiesty, lively and energetic. There was a thunderstorm here 3 weeks ago and Daisy started getting lethargic...

He's has been having issues with flying. He was born with two different shaped eyes/eyelids so I imagine there could be something wrong within his head. I'm 70% sure it's neurological but I could be wrong. He flies very slow and when he does, he makes slight noise as if he's injured or something...

Hi everybody! I posted about my green cheek Remmy who sustained a traumatic brain injury about a week ago, so heres a bit of an update and a few more questions! Remmy is doing somewhat better. He's on painkillers which are helping, and his personality seems to be coming back slowly but surely...