My bird is losing weight. What are the possible causes and next steps?

I'm sorry to hear Scooby isn't doing well. Weight loss and the inability to fly are concerning problems that could be caused by a number of things including poor diet, internal parasites, illness and injury. Making sure Scooby is on a balanced diet is a good first step, however I would also recommend bringing him into your local vet to check for any parasites or underlying illness that could be causing his symptoms. Moving him to a warm hospital cage if he is housed with other birds, and with easy access to food and water may also help until you can be seen by your vet.

I would recommend getting a small scale (possibly a food scale) and weighing ZR every day for a week. IF he weight decreases but goes back up I would not be to concerned. IF you find his weight decreases over the week but he is still eating I would recommend taking him to the vet for blood work. weight loss could be a sign of illness in ZR. With his young age I really think it is most likely a normal change in weight due to growing and maturing

You can have Rangu examined by your veterinarian to confirm good health and a proper weight. Birds have different body types just like people, so there will be variations. Monitor weight, appetite, behavior and droppings. If there are any negative changes, have them addressed by your vet.

Nutritional deficiency, liver or kidney disease, intestinal parasites or bacterial, viral or fungal infection are all possibilities. An exam with your veterinarian or an experienced avian veterinarian is strongly recommended to diagnose the exact illness or injury. The vet can administer supportive care if indicated. Offer a commercial pelleted diet moistened with warm water or a hand feeding formula to stimulate his appetite and get some nutrition into him. Keep him warm and as stress free as possible until he sees the veterinarian.

If Baru is regurgitating to the point of losing weight it sounds as if there may be a deeper problem going on. Prolonged stress or illness may both cause chronic regurgitation, as well as some infections, parasites and even obstructions of the crop or digestive tract. Since he is losing weight and doing it a lot, it is best to bring him to a local avian vet for a complete exam to figure out the underlying cause.

Thanks for reaching out about Nibbles. A bird this small/light weight probably needs diagnostic testing to determine the problem. You should start with a CBC (complete blood count) to look for signs of infection, a serum biochemistry to check kidney/liver function, and possibly radiographs. You need to feed more than twice daily and improve the caloric intake, but food is not fixing the problem. Continue to heat support so Nibbles doesn't get cold and have to shiver to generate heat, thereby using up calories. Good luck.

Snowy is probably ill, but i couldn't tell you what is wrong based on these very general symptoms, you will need to take him to an avian vet where a blood test and faecal exam will be done to determine what is the cause of the disease before it can be treated.