My friend (not good in English) has two budgies female and male. The first was female and afterwards male. He join female in the cage on January. Everything was so far, but then started problems. The female budgie is aggressive to male budgie. She is also very loud. Why it is so? What my fiend should do?

What size is the cage ? and are you certain they are male and female ?

The cage is 60cm, 40 cm, 74 cm. But both of them live in the room, just for a food and sleepig they get in the cage.

is she aggressive with him in the cage or outside the cage?

Is she aggressive over a certain toy such as a mirror, bell etc??

When is she most aggressive morning, afternoon or evening?

is she aggressive with him in the cage or outside the cage? Mostly when they are in the cage.

Is she aggressive over a certain toy such as a mirror, bell etc?? No.

When is she most aggressive morning, afternoon or evening? it daoes not matter.