Some research shows that birds may just be able to recognize who their human friends are even if you, for instance, change clothes every day like normal people usually do. This is because it appears birds can recognize faces and differentiate between voices, something that was believed to be impossible in the past.
However, it’s not that hard to believe if you think about it because the ability to distinguish friend from potential foe could prove key to a bird’s ability to survive out in the world. The birds used in experiments showed the ability to spot differences when it came to photographs of objects that were known to them and those which were not.
Therefore, it’s quite possible to say that budgies will recognize you and understand that you are the person who takes care of them, something which can be very important in building your mutual relationship.