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can mold kill parrots?

Is Mold Bad for Parrots? (Aspergillosis)

Last Updated on: 28th November 2023, 11:08 am

Mold affects parrots far more than it does humans. Unfortunately, inhaling fungal spores can severely damage a parrot’s respiratory system, often with life-threatening consequences.

Mold is dangerous for parrots because it can cause a respiratory condition called aspergillosis. This occurs when a parrot inhales the spores produced by mold. These accumulate in the air sacs and lungs.

Parrots with compromised immune systems and older birds are more susceptible to mold exposure.

Aspergillus contaminates a parrot’s environment but isn’t a disease that’s transmissible between birds. Also, the disease isn’t zoonotic, so humans aren’t at risk of being infected by their pet parrots.

Can Mold Kill Parrots?

If a parrot is exposed to mold, it may develop aspergillosis. This happens when the cage isn’t cleaned frequently enough, as it’ll be dirty and damp for long enough for mold to grow and multiply.

The parrot will grow seriously ill long before aspergillosis is fatal, exhibiting these symptoms:

  • Lethargy.
  • Inappetence.
  • Weight loss.
  • Difficulty breathing.
  • Wheezing.
  • Coughing.
  • Unusual vocalizations.
  • Tail bobbing.
  • Fluffed feathers.

Black mold can damage the brain, nervous, and respiratory systems of birds who inhale it.

After several weeks in a cage with mold, a parrot will eventually die from this respiratory disease. However, you can usually see mold before it dries and becomes airborne.

mold poisoning in parrots

How Mold Hurts Parrots

As mentioned, the primary threat mold poses to parrots is aspergillosis, which takes several weeks to develop. If a parrot enters a room that contains mold, it won’t immediately become ill.

Limited Contact

Mold is produced by excess moisture (dampness, leaks, spillages, etc.) It’s common to see mold growing around the home during the rainy season. It won’t harm the parrot’s health at this early stage.

Direct Contact

A parrot may get fungal spores on its feet or beak if the mold isn’t removed. However, a bird-safe cleaning agent makes external mold growth easy to remove.

Inhaling Fungal Spores

The danger arises when dryness in the air causes the mold to release spores.

Parrots breathe in those spores, so they’ll accumulate in the lungs and air sacs. This is dangerous because parrots inhale twice as much oxygen as humans.

When a parrot exhales, it doesn’t leave the body. It reaches the air sacs until the bird breathes again.

Aspergillosis develops gradually, so it only becomes apparent once it begins to affect a bird severely.

Does My Parrot Have Aspergillosis?

Here are the differences between acute aspergillosis and chronic aspergillosis:

Acute Aspergillosis

Acute aspergillosis gradually harms the following:

  • Lungs.
  • Air sacs.
  • Syrinx.
  • Trachea.

During this stage, most of the parrot’s organs remain uncompromised. However, there’s an increased amount of drinking and urination, indicating kidney failure.

The common symptoms of acute aspergillosis include:

  • Lethargy.
  • Increased thirst.
  • Increased urinating.
  • Difficulty breathing.
  • Trouble vocalizing.
  • Change in voice.
  • Green discharge.

According to the Journal of Zoo and Wildlife Medicine, a parrot with aspergillosis may experience leg paresis, which is the partial or complete loss of voluntary movement.

The parrot (in the above study) had no respiratory troubles, leading experts to believe that aspergillosis can cause paresis without other symptoms.

Chronic Aspergillosis

The organs are damaged at this stage, and little can be done to treat the parrot.

The symptoms of chronic aspergillosis are similar to acute aspergillosis. The only difference is that parrots with chronic aspergillosis can experience the following:

As the organs deteriorate, so does the central nervous system.

If the parrot survives long enough for the nerves to be affected, these physical problems will manifest. Unfortunately, aspergillosis can destroy the organs and the nervous system.

Causes of Aspergillosis

Parrots are more vulnerable to aspergillosis due to the way they breathe. While mold harms any living creature, it’s deadly for parrots due to how long the spores remain in the body.

Humans may breathe in the spores, but they leave the respiratory system when we next exhale.

With parrots, the spores travel through to the posterior air sacs and lungs. Some spores leave the body in the next breath, but parrots take extra steps when breathing, so the spores remain for longer.

When bacteria enter the body, its first line of defense (the autoimmune system) will be activated.

Infections can weaken the immune system if the parrot breathes in lots of spores frequently. So, when is a parrot most likely to develop aspergillosis?


When stressed, parrots develop the following problems:

  • Inappetence.
  • Grow weaker.
  • Become disinterested in exercise.
  • Preen their feathers less often.

This impacts how the parrot can function physically and mentally.


While pellets aren’t exempt from moldiness, they often contain preservatives that minimize the risk.

Parrots on formulated diets that eat berries, fruits, vegetables, and seeds are likelier to eat something moldy. Another culprit is monkey nuts (peanuts), as they grow underground.

Birds should never be fed moldy bread. Bread isn’t nutritious for birds, and the mold contains fungal spores that cause aspergillosis.


Malnourished parrots are more likely to get infected with aspergillosis sooner.

The parrot’s immune system can’t fight off sickness without a well-optimized diet. Once infected, the parrot will lose its appetite, leaving it with a compromised immune system.

Cage Hygiene

Cages allow mold to grow because they’re often wet due to spilled drinking water and excretions.

Cage hygiene is often why parrots develop aspergillosis in dry, hot climates. The spilled water generates humidity, and the dryness and heat enable the mold to produce spores.

Leftover food and old paper promote mold growth, so inspect and clean the cage frequently.


If a parrot is on medication, ask the vet how it affects the immune system. Certain antibiotics can destroy immune cells and leave the parrot vulnerable to infections.


How to Prevent Mold Poisoning in Parrots

Mold poisoning causes an infection that’s difficult to clear once it becomes chronic. Not much can be done for a parrot with chronic aspergillosis. Preventative steps can be taken:


Allow the parrot to go outside on a harness or in a cage during the summer. The heat will:

  • Dry out the parrot’s feathers after a bath so mold doesn’t grow.
  • Encourage the parrot to be more active, thus aiding its respiratory system.

You can crack open a window when you aren’t home to let in the sun. Never leave a parrot’s cage in the sun unattended because the bird will overheat and dehydrate.

Moldy Cage Hygiene

Deep clean the cage at least once a week. Don’t use bleach or traditional cleaning products. Instead, use white vinegar to clean the cage. Then, leave it out in the sun to dry and kill off mold.

Clean the House

Deep-clean the home after the rainy season ends to remove mold before it produces fungal spores.

Bathrooms can be problematic due to the high humidity. Always dry and aerate the rooms, and consider using mold-proof paint to keep the problem in check.


A dehumidifier can lower the humidity in your home. They’re a long-term solution that can be placed in the room where the parrot lives, reducing the amount of mold growth.

Relocate The Parrot

If you notice mold in your home, move the parrot to a different room until it’s been removed. The parrot’s cage can be returned once the problem is resolved and the air is clear.