There are lots of people who are known to sing in the shower. One possible reason is because they are so happy when they’re washing that they can’t help but sing.
Another reason is that they are shivering cold so they would try to distract themselves from the cold by singing (or try to generate energy by exerting the lungs and vocal cord).
Yet another reason is that they love to sing but they are so shy about it that it’s best to mask the singing with water noises.
This video shows us that apparently parrots also sing in the shower. The reason for it, however, is not clear from this clip. The parrot’s name is Lollypop.
The highlight of this clip is when her human mommy called her a bad bird in the shower. Lollypop had the perfect answer. She started singing, “Bad boys, bad boys, what you gonna do?” Flat out hilarious!