Length of a forearm of Nyctalus Noctula of 48-58 mm. When the mouth of the red night-school student is opened, from its corners stick out big white glands. Wool short, adjacent; roots of hair the light; on a back fur red (at recently refading small animals - chocolate color, on a stomach - tone is lighter; naked parts of a body dark brown.
The wing-shaped bone is well developed and at early stages of an orthogenesis takes part in formation of oral part of the basis of a skull while at other mammals it only covers from above a wedge-shaped bone. Interparietal bone pair and very large. A nasal bone wide, strongly truncated. The plaintive bone is not found.