Some of the symptoms are:
bells
Yes, budgies can certainly imitate whistling sounds.
Yes they do! In fact I have 3 budgies of my own.
dont ask that again cause it sounds wrong and i dont know
Budgies don't make a nest like other birds. In the wild they prefer a shallow hole in the ground or in a hollow tree.
No, budgies do not sing. They chatter a lot, mimic other sounds, and whistle, but they are not songbirds and thus do not sing.
yes budgies do make nests if the budgie is in the wild it will make a nest in a hollow or branch. if it is in an aviary/house it will make a nest and lay an egg everyday in a nesting box (if provided)
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
it does not make any difference
This question is a matter of opinion. Some people like English budgies better than regular budgies or other people like regular budgies better than English budgies.
Yes, budgies are parakeets.
Budgies are parakeets. They eat seed
It's nice to have a couple of each.