Byangoma (Bengali ব্যাঙ্গমা, feminine Byangomi ব্যাঙ্গমী) are legendary birds of Bengali mythology, appearing most notably in the fairytales of Thakurmar Jhuli, where they are portrayed as wise, fortune-telling birds that help the deserving.
The Bengali fairy-tale stories describe how the nestlings of these birds are sightless at birth and how few drops of blood from a donor (Maiya Joi) can activate their sight.
References
Byangoma Wikipedia(Text) CC BY-SA