05/26/2026
Our Umbrella cockatoo patient decided our tech Stacey’s shirt looked like a good place to hide. While that may have been just curiosity, the behavior can also be hormonal, as it could be a bird seeking a place to nest.
In the parrot world, spring is often synonymous with hormones. However, did you know that hormonal behavior in parrots can be influenced by environmental factors in our homes and is not necessarily limited to a particular season?
Longer daylight hours and warmer weather can trigger hormonal responses in some parrots, and some species from other parts of the world, like Australia, may also have a hormonal phase again in the fall.
However, pet parrots can become hormonal and remain in that state year-round if their indoor environment triggers the response, driven by factors such as long daylight hours, warm temperatures, diet, and access to places that resemble a nest. It is very unhealthy and stressful for your bird to remain in that state.
It is important to understand your bird's hormonal behavior so you can discourage it. Many birds seek out dark, enclosed areas when hormones prompt them to nest. They may chew intensely, shred papers, and try to hide under furniture, in cabinets, in cardboard boxes, under sheets and blankets, and even in a person’s shirt!
It is important to prevent your bird from indulging in these behaviors by blocking access to any place that could provoke the response.
Another commonly given bit of advice is to limit touching to the bird’s head, but birds are individuals, and a specific type of touch may not affect all birds the same way. It’s best to watch your bird for any signs of hormonal behavior, such as panting, vibrating while making noises, crouching, rubbing the vent on toys, a perch, or even a person’s hand or arm, and regurgitating. If these behaviors occur after a particular type of touch, discontinue that touch.
Regarding the advice often given to limit petting to the bird’s head, some parrots become hormonal when their head feathers are preened. So it is best to view your bird as an individual and avoid doing things you notice trigger your bird. Many birds can become hormonal when stroked down the back or touched under the wings, so these types of touch are best avoided or at least be aware that they could cause a hormonal response and discontinue immediately if your bird becomes hormonal.
Hormonal behavior is frustrating for a bird. It can lead to unwanted behaviors like biting, lunging, screaming, and territorial guarding. It can even lead to feather-destructive behavior and grave health complications like excessive egg-laying and cloacal prolapse, where internal tissue protrudes from the bird’s vent, which is a life-threatening emergency requiring immediate veterinary care from an avian veterinarian.
So, it is best to avoid triggers like petting that instigate a hormonal response, dark places that could make your bird want to nest, and keeping your bird awake in a light room for more than 12 hours. Birds do best with 10 to 12 hours of uninterrupted sleep in a dark, quiet room.
Since diet can affect your bird’s hormonal behavior, it is best to keep track of what you are feeding when hormonal behavior occurs and go over this information with your bird’s veterinarian. He or she can make suggestions tailored to your bird's specific needs and may suggest cutting back on high-fat foods like nuts or sugary fruits. Weight gain can also result from hormonal changes, and monitoring weight is a good idea.
In cases of ongoing hormonal behavior where increased darkness, removal of nest sites, discontinuation of petting, and dietary changes have not been effective, consult your avian veterinarian, as treatments are available.
It is important to realize that hormonal stress is harmful to pet birds, so we must do what we can to prevent hormonal triggers. Do you know your bird’s hormonal triggers?