Nest boxes

Unlike other birds, budgies prefer nesting in a hole in a tree to building the nest themselves.
That's doesn't mean they're lazy - it's in fact really clever. Wild budgies breed during the rainfall in Australia, and without their "little cave" in the tree, they would get really cold and wet...

photo: pittwateranimalhospital.com.au

The budgies you keep at home will be satisfied with a wooden nest box, preferably a long horizontal model.