Common Noctule

Identification

The common noctule is a robust bat with a distinctive pointed snout and large ears essential for echolocation. Adults weigh 25–30 g with a wingspan of 37–40 cm (15–16 in). Its short fur is dark brown immediately after moulting in June (males) or July/August (females), later changing to red-brown before winter. When airborne, noctules are characterized by their long, broad wings and rapid, powerful flight.

Range & Habitat

This species is common throughout Europe, Asia, and North Africa, ranging from western Europe through central Russia, across the Ural Mountains, the Caucasus, Turkey, and the Near East to southwestern Siberia, the Himalayas, China, Malaysia, Taiwan, and Japan. Noctules typically occur at altitudes up to 2,000 meters across diverse habitats including deciduous forests, agricultural landscapes, and small to medium-sized woodlands. They have adapted exceptionally well to urban environments, with thriving populations in cities such as Hamburg, Vienna, and Brno.

The species commonly roosts in tree cavities and buildings—particularly attics—during daylight hours, though bat boxes attached to trees are also utilized. Despite their woodland preference, noctules forage up to 20 kilometers away from woodland at night, often exploiting street lights to locate insects.

Behaviour & Diet

Common noctules are renowned for their high-flying foraging technique, hunting at altitudes reaching 1,000 meters with speeds of 20–60 km/h. They begin flying in early dusk, earlier than most European bats, and possess short daily activity periods totaling one hour or less before sunrise and after sunset. This means they must cope with up to twenty-three hours of fasting daily due to the temporal scarcity of insect prey.

Their diet consists mainly of beetles, moths, and winged ants, which they detect using sophisticated echolocation. The species uses two main echolocation calls: one at 26–47 kHz (peaking at 27 kHz) and another at 22–33 kHz (peaking at 22 kHz). Noctules are highly migratory, with females traveling from northern breeding grounds—as far as the Baltic region—to southern wintering areas hundreds of kilometers away, while males remain sedentary. Females give birth to one or two young annually after six to eight weeks of pregnancy, rearing offspring to full size on milk alone within three to four weeks.

Best Time & Places to See It

Noctules are most active during dusk and early evening hours, making early evening the prime time to observe them in flight. Summer is ideal for seeing solitary males or small bachelor groups in forested areas, while late summer and early autumn offer opportunities to observe males displaying elaborate singing behavior to attract females in harem roosts. Urban observers should look toward street lights after sunset, where insects concentrate and noctules hunt.

Central European cities offer reliable viewing opportunities year-round. In winter, hibernation colonies sometimes exceed 1,000 individuals in caves, church steeples, and building cavities, though these roosting sites require careful approach to avoid disturbing the hibernating bats.

Photography Tips

Photographing noctules requires preparation for low-light conditions and fast-moving subjects. Position yourself near street lights or forest edges during early dusk to capture them in flight against remaining twilight. Their high-flying foraging behavior means wide-angle compositions may work better than traditional close-ups. Fast shutter speeds (1/1000 or faster) are essential to freeze their rapid wing beats. Early autumn offers additional opportunities to capture males' dramatic courtship displays in harem roosts, though these require specialized permits and careful ethics to avoid disturbance.