Tetrao urogallus (also called the Wood Grouse) is known as the biggest bird of the forest. Now its population is decreasing and for the reason to protect this wood creature in Lithuania it is included in the Lithuanian Red book. Tetrao urogallus has a few characteristic details: the red big eyebrow, blue-green feathers, impressive tail as a fridge. This bird lives in Europe, Asia and Siberia and is the adornment of the forest.