The brown nose of a budgerigar indicates that it has entered estrus, which is a sign of sexual maturity. When a female budgerigar is in estrus, the nasal membrane will turn brown, fleshy brown, etc., while the nasal membrane of a male budgerigar will turn blue, dark blue, etc. This is a normal physiological phenomenon.

Performance of budgies in estrus

1. The female bird will peck around in the nest box and will constantly enter and exit the nest box.

2. The male bird stands on the perch and keeps rocking up and down. He will chase the female bird and tease the female bird with his beak from time to time.

3. The male bird and the female bird are obviously closer than usual and will groom each other. The male bird will also take the initiative to put food into the female bird's mouth.

4. The female bird will stretch out her beak to ask for food from the male bird, and shake her head, just like a small bird asking for food from a big bird, and make a very sharp sound, which is more harsh.