Q. My budgie seems to have caught a cold. He is trembling slightly, not moving as much as he usually does and is sleeping continuously. What can I do?
DAVID ELBEZE, DVM, MRCVS
A. These are general signs of disease (not likely to be a "cold"), once a budgie shows sign like these it's usually when the disease is already pretty advanced and severe.
Most common conditions in budgies are bacterial infections, intestinal candidiasis and metal intoxications.
I recommend taking him to an avian vet as soon as you can as there is nothing that can be done for him without a diagnosis and proper medications.