Depends on what's going on with the birds. If they have eggs or babies, the reason is obvious. If no eggs/babies, some birds like to "hide out" and/or enjoy the comfort and security of enclosed places like a nesting box.
well parakeets tap on the top of there nesting box to either sharpen their beak or for some fun they are probably wondering what this thing is my bird Pepsi all ways used to do this for fun and for safety
A parakeet would only do such a thing if it knows that the egg would never hatch. If you have noticed, in every nest, there is always at least one egg that doesn't hatch. Some birds can tell which egg it will be, and take them out beforehand.
a box
I don't know any animal that is really fussy about where to have sex - including parakeets.
just place the nest box near the top of cage and make sure they have access to get in it and leave them alone
Parakeets need a nest box but not a "nest" in the traditional sense. A typical Parakeet nest box measures about 10" by 10" by 10" with a hole in the front (like a bird house) and a back where you can remove the top half to check the chicks and clean it out. In the bottom of the box, you place a wooden insert the same size as the box with a concave cut-out in the center (makes a shallow dish so the eggs stay in one place). You hang the box on the outside of the cage with the hole and a dowel (for perching) mated and secured up against a seed cup hole. No nesting material is used at all and the birds like it that way.
Petco and Petsmart has them
In or out of what? Their nest box? They should stay in their nest box until they are able to get out by themselves. Is that your question?
yes
you do not need to give them any material the mom and dad will pick off some feathers and put them in the nest for the eggs to be you can try and give them something but they might not take it.
Parakeets, like most other domestic Birds, like to have a place that is most like a nest. A Breed Box is a special box made out of wood or some other material. In some Breed Boxes, there may or may not be a shallow dip in it, so the mother bird thinks her 'nest' is, well, more like a nest like in the wild.If you provide a nest box, it will Encourage a pair of birds to mate, and if the the female does in fact lay eggs, then she would most likely lay them in the most nest-like spot she can find in her cage.Sometimes birds will not mate or lay eggs because they do not have a Breed Box. I know this from past experiances with my own pairs of birds. I hope my info helped you =D
Parakeets lay fertile eggs when they are with the opposite gender (i.e male with female) and they have a warm, comfortable place to lay it such as a nest box.
Parakeets don't really make nests like finches for example. In wild they nest in holes in trees, and in captivity they need nesting boxed. wild budgies use hollow trees for there nest. Domesticated budgies you have to buy a nest box or they will not mate also if u want to know how to make a nest box goggle it for peace sakes
The parakeets will lay their eggs in a nest that they build themselves. The parakeets will sit on the eggs until all have hatched. The eggs should hatch after 18 days.