This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Baykok (Ojibwa)
The Baykok is a character from the Anishinaabe aadizookaan (traditional stories). It is said to fly through the forests of the Great Lakes region. The cries of Baykok are also described as being shrill. Described as "Death" in The Song of Hiawatha, it is said to appear as an extremely emaciated skeleton-like figure, with thin translucent skin and glowing red points for eyes.
The Baykok only preys upon warriors, but does so ruthlessly, using invisible arrows or beating its prey to death with a club. The Baykok, after paralyzing or killing its prey, then devours the liver of its victim. Baykok was also said to approach a sleeping hunter, gently cut an opening in the chest and remove a piece of the stomach, without waking the victim.