# Savi's Pipistrelle (Hypsugo savii) - Web page: https://www.funwildfacts.com/europa/mammal/savi-s-pipistrelle - Published: 2026-05-30 - Last updated: 2026-05-30 ## Overview Savi's Pipistrelle (Hypsugo savii) is a small but fascinating bat species that thrives in mountainous regions and urban environments across much of southern and central Europe. With a body length of only 4.5-5.5 centimeters and weighing just 5-10 grams, this is one of Europe's smallest bat species. Despite its tiny size, this is a robust and adaptable species capable of living at altitudes up to 3,000 meters above sea level. The fur is golden-brown to reddish-brown on the dorsal side and lighter underneath, with characteristically dark wings and ears. This bat is a skilled hunter that specializes in catching small insects at high flight altitudes, often 10-40 meters above ground. Unlike many other bat species that fly along vegetation edges, Savi's Pipistrelle often hunts in open airspace and around mountain cliffs. Its echolocation calls are high-frequency, typically between 25-30 kHz, making them difficult for humans to hear without special equipment. The flight style is fast and direct, with rapid wingbeats that can resemble a large insect at dusk. Savi's Pipistrelle has demonstrated an impressive ability to adapt to human environments. It often breeds in cracks in buildings, behind shutters, under roof tiles, and in rock crevices. During summer months, females form colonies of 20-100 individuals where they raise their young, while males typically live more solitarily. The species has a flexible reproductive strategy and can adjust its breeding timing according to local conditions. Although the species is common throughout its range, it faces certain threats. Renovation of old buildings can destroy important breeding sites, and the use of insecticides reduces food availability. Light pollution can also disrupt their hunting behavior. The species is partially migratory—populations in northern parts of the range move southward in winter, while southern populations often remain and hibernate in their summer quarters. ## Quick facts - Weight: 5–10 g - Length: 4.5–5.5 cm - Wingspan: 22–25 cm - Top Speed: 35 km/h - Lifespan: 5–16 yrs - Diet: Insectivore - Conservation Status: Least Concern ## Habitat Savi's Pipistrelle is strongly associated with mountainous environments, rock formations, and rocky landscapes in the Mediterranean region and Central and Eastern Europe. The species prefers warm, dry climates and is often found in mountain ranges, cliff faces, and rocky ravines where it uses natural crevices for roosting and breeding. It thrives particularly well in areas with mixed vegetation where open spaces alternate with trees and shrubs, creating good hunting grounds. In modern times, however, the species has shown an impressive ability to colonize urban environments. Cities and villages in southern Europe often host large populations living in buildings, behind shutters, in walls, and under roof tiles. This adaptability has made the species successful in cultural landscapes. In winter, they seek shelter in caves, rock crevices, or buildings where temperatures remain relatively stable. The species can find suitable dwellings from sea level to alpine zones, demonstrating its ecological flexibility. - Mountain - Rocky Cliffs - Urban - Woodland - Coast - Farmland ## Seasonal Behavior Savi's Pipistrelle exhibits a clear seasonal pattern that varies with geographic location. In northern parts of its range, the species migrates southward in autumn, often hundreds of kilometers, to find suitable overwintering sites. The duration of winter dormancy depends on climate—in mild Mediterranean areas they may remain active much of the winter when temperatures allow, while in colder regions they enter deep hibernation from October to March. In spring (April-May) they awaken and establish breeding colonies. Mating occurs in autumn, but females store sperm over winter and fertilize their eggs only in spring. Young are born in June-July after approximately 60 days of gestation, and after three to four weeks they are capable of flight. Autumn is devoted to building up fat reserves for winter through intensive hunting. ## Breeding - Gestation: 60 days - Offspring: 1–2 ## Behavior & Ecology - Activity Pattern: Nocturnal - Social Behavior: Females form maternity colonies of 20-100 individuals during summer where they collectively care for their young, while males live more solitarily or in small groups. - Migration: Partial Migrant - Population: Population considered stable throughout most of its range with locally common occurrences, especially in southern Europe ## Did you know? - Savi's Pipistrelle can fly at altitudes up to 3,000 meters above sea level, higher than most other European bat species! - A single bat can consume up to 3,000 small insects during a single night—that's like eating its own body weight in food! - Their heart rate can vary from 1,000 beats per minute while flying to just 25 beats per minute when resting in hibernation. - Savi's Pipistrelle uses its large ears like a kind of parabolic antenna to capture its own echoes and locate prey in complete darkness. - Females can 'pause' their pregnancy if conditions are poor, a phenomenon called delayed implantation. - Young are born completely hairless and blind, but can fly on their own after just three weeks! - These tiny bats can live up to 16 years, which is remarkably long for such a small mammal. - They can recognize their own echoes among thousands of other sounds in a colony—like hearing your own voice in a packed football stadium! ## Taxonomy - Kingdom: Animalia - Class: Mammalia - Order: Chiroptera - Family: Vespertilionidae - Species: Hypsugo savii ## Image - URL: https://images.djurfakta.com/animals/savis-dvergfladdermus/1777968147198-1.jpg - Photo: Hypsugo_savii_Trtar.jpg: Tomaž Jančar derivative work: Linnea - License: CC BY-SA 3.0 ## Other languages - sv: https://www.djurfakta.com/europa/mammal/savis-dvergfladdermus - da: https://www.dyrefakta.com/da/europa/mammal/savis-dvaergflagermus - no: https://www.dyrefakta.com/europa/mammal/savis-dvergflaggermus