What is "sukh-shari"

Sukh-Shari (literally translated as 'Happiness-Song'), are an imaginary pair of birds who appear in Rupkatha's Bangla fairy tales at random. They have the capability to speak like humans. Sukh is the male bird and Shari is the female bird. They are wise and well-informed about the story's secrets. They usually sing about good deeds of people, answer questions in riddles and usually converse in rhyme.