Why does my budgie have occasional watery stools but seems fine?

Birds will naturally have a bit of a watery stool (compared to say, dogs or cats), that usually has a solid and liquid component to it that dries quickly. If the stools are completely watery, discolored, or you're seeing signs of illness such as refusal to eat, weight loss, etc. it may indicate an issue such as a parasite or infection and should be checked out by a vet.

If you've fed Miki any treats recently or changed his diet, it's possible the watery stool could be from that. Some fruits and veggies can cause an increase in watery stools, and removing them for a few days should allow the stool to return to normal. Other issues such as parasites, illness, etc, may have prolonged watery droppings, or you may see other symptoms such as decreased eating and drinking, not being as active, etc. If removing any treats or letting Miki adjust to a new diet doesn't clear up the stool issue in a few days, or you see worsening symptoms, scheduling a vet check to rule out more serious issues is best.

Diet changes can affect the stool, and if you're feeding any extras in addition to the diet change, this could be causing the change you are seeing. It is also possible that his current diet is causing some minor GI upset if it changes immediately after eating and then returns to normal. Other issues such as internal parasites can also cause stool changes, so ruling out and treating for any parasites may be a good idea. Removing any extras such as fruit and veggies and providing only his balanced diet for a few days may also help him adjust and his stool return to normal. If the problem persists, or you see any other symptoms or changes such as reduced eating/drinking, lethargy, etc, then seeking vet care in person to rule out any more serious issues is best.

Fruits and new food can definitely be a cause of watery stool, especially if it started after all these changes. I would remove any extra treats for a few days and only feed the new food to see if that helps settle his stomach down. Once he's settled in, you can then add in treats one by one to see how he does. If the loose stools continue even after a few days on the diet with no snacks, or he shows any other signs of illness, a vet visit is always best.

Unfortunately, those are symptoms that need to be seen in person by a vet, because they are not possible to diagnose over the internet. If multiple of your birds are having loose stools and are housed together, I would be concerned there is something going on such as a contagious illness, parasites, nutritional issue, or unclean environment. Treating for parasites and making sure all birds have access to fresh food and water and a clean environment may help. Separating out any sick birds until they recover may also help. If the problem continues, your bird(s) worsen, or they do not improve with home treatment, then you will need to find a vet in your area that can take a look at them and determine the problem.

Looser stools can be caused by a number of things. If you've recently given Sky a bunch of snacks (such as fruits and veggies) or changed her diet, this can cause temporary stool color changes or moist stool. Removing any extra treats and letting her adjust to her new diet for a few days may help. If she has differently colored pellets in her food, this may also cause color changes to the stool as well. Other causes can include parasites, GI upset, illness, nutritional issues, metabolic issues, etc. If she didn't have a diet change or any snacks, or is showing other signs of illness in addition to the loose stool/color change (you mentioned she is less active), then having her examined by a vet is best. They can treat her for parasites and help rule out any more serious underlying conditions that may require treatment.

Submit a sample to your veterinarian to diagnose parasites or bacterial/fungal overgrowth. Discontinue feeding fruits and vegetables until the stool is normal, then introduce one at a time slowly. Clean and sanitize the cage, bowls, toys and perches. Discard anything that cannot be sanitized. Use paper towels on the cage bottom and change them daily until his droppings are normal. Provide plenty of fresh, clean water. Keep him warm and as stress free as possible. If he develops lethargy, loss of appetite or if the droppings don't begin to firm up in the next 24 hours, have him examined by your vet or an experienced avian vet.