Hormonal weight gain?
Is there anything known about female parrot weight year cycle? I have an adult female blue headed pionus and she gains weight every spring (when the daylight hours increase) and then decrease again in weight less starting from mid-summer. I have made a excel -diagram for her weight spanning several years and it is the same cycle every year. She eats the same amount and same type of food all year round. Can it be hormonal that she gains weight in spring?