This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Bauk (Slavic)
Bauk is an animal-like mythical creature in Serbian mythology. The bauk is described as hiding in dark places, holes, or abandoned houses, waiting to grab, carry away, and devour its victim; but it can be scared away by light and noise. Though malicious by nature, the Bauk does not go looking for victims to prey on. Rather, they tend to keep out of sight in their hiding places in the hopes that an unsuspecting person would walk in.
Interpretation of the bauk's attributes leads to the conclusion that the bauk is actually a description of real bears, which were already regionally extinct in some parts of Serbia and known only as legend. Bauk are malicious bear-like monsters found in Serbian folklore that were known to hide in dark or abandoned places and wait for victims to stray too close before attacking and trying to devour them.