He's an adult male and recently lost his adult male friend. I got him a new friend, a baby female budgie. The lady told me thats the best way to go so that they get on well. Well she's settling right in and they have no problems at all. So just wanted to know if they will breed if theres no nest in the cage?

Breeding

Breeding in the wild generally takes place between June and September in northern Australia and between August and January in the south, although budgerigars are opportunistic breeders and respond to rains when grass seeds become most abundant. Budgerigars show signs of affection to their flockmates by preening or feeding one another. Budgerigars feed one another by eating the seeds themselves, and then regurgitating it into their flockmates' mouth. Populations in some areas have increased as a result of increased water availability at farms. Nests are made in holes in trees, fence posts, or even logs lying on the ground; the 4-6 eggs are incubated for 18–21 days, with the young fledging about 30 days after hatching.

pets question and answers,www.5d2d.com

In the wild, virtually all parrot species require a hollow tree or a hollow log as a nest site. Because of this natural behavior, budgerigars most easily breed in captivity when provided with a nest box. The eggs are typically 1 to 2 centimetres long and are plain white without any coloration. Female budgerigars can lay eggs without a male partner but these eggs are unfertilised and will not hatch. When the female is laying eggs her cere turns a crusty brown colour. A female budgerigar will lay her eggs on alternate days. After the first one, there is usually a two-day gap until the next. She will usually lay between four to eight eggs, which she will incubate (usually starting after laying her 2nd or 3rd) for about 21 days each. Female Budgerigar only leave their nests for very quick defecations and stretches once they've begun incubating and are by then almost exclusively fed by their mate (usually at the nest's entrance). Depending on the clutch size and the beginning of incubation, the age difference between the first and last hatchling can be anywhere from 9 to 16 days. Rarely female has the habit of eating the eggs in case of insecurity.

They may. However, the egg will not hatch if they do not sit on it. Usually they don't like to do this if there is no nest box. There's a great chance the egg would get damaged just by laying on the bottom of the cage itself, any movement and they egg bumps across the bars, it can ruin the embryo. Eggs are very very very touchy. Birds usually don't like to breed unless there is a nest box up. Warning though, she may lay eggs and it doesn't necessarily mean they have mated. Females do lay eggs sometimes, just like chickens and laying an egg a day. You can always simply pull the egg if you are worried about babies.