Why is my Sun Conure's forehead turning green? Is it serious?

As far as I can see from the photo, the feathers look normal and healthy. Some color change and darkening of feathers is normal, and the feathers may continue to change somewhat until Pa Pa reaches maturity. Molts can also change feather color some as old feathers fall out and new ones come in. If he is otherwise healthy, normal, and active, I wouldn't be worried. If the feathers change rapidly, fall out, seem bothersome, or you notice any signs of illness in addition to the changes, scheduling a checkup with your local vet to rule out any health issues is always the best course of action.

Bird droppings normally contain some green as well as white and some liquid. If you feed mainly seeds, the droppings will be mostly green. A pelleted diet will make droppings darker. Some feather loss is normal as she matures. Her first molt may be around 8 months of age. Symptoms of illness that warrant an exam with your veterinarian include lethargy, decreased appetite, loose droppings, perched with feathers fluffed, vomiting or excessive regurgitation.

Stress and diet can both contribute to feather health and coloring. As long as your bird is behaving normally otherwise, there is likely no cause for concern. Monitor for lethargy, loss of appetite, loose droppings or excessive feather loss (not due to molting). These are symptoms that should be addressed by your veterinarian or an experienced avian veterinarian.

Without seeing a photo it is hard to tell what you are describing. Normal aging can cause the beak to change color as a bird matures. Injuries to the beak may cause bruising or discoloration, malnutrition or other illnesses may also cause beak color changes. If you're seeing any other signs of illness, it is always best to seek veterinary care to have the beak looked at and determine if it is an issue.

Feather changes can be for a number of reasons including normal molting, aging to adulthood, parasites, skin issues and nutrient problems. If Rangu is acting ill at all (not eating or drinking, sleeping a lot, losing feathers, etc) scheduling a vet checkup to look for any potential issues is best.

It looks like Pretty Boy may be having a reaction to something causing the redness. External parasites such as mites, excessive itching, and rubbing on cage bars may all cause redness or loss of feathers. Infections from bacteria or fungus may also cause feather loss and redness. It is best to have the area looked at by your vet, who can recommend treatment such as a mite medication or antifungal to help the area clear up. It can take some time for the feathers to regrow, so even after treatment it may take a little time for the area to return to normal.

Thanks for reaching out about Shamrock. Feather color can be affected by a lack of pigments in the diet, metabolic causes (liver function or intestinal absorption) and some possible viral diseases. A veterinary visit is recommended to assess and provide a diagnostic/treatment plan, and to review diet. Good luck.