Common Vole

Fascinating facts about the Common Vole

• After a short gestation of 16 to 24 days, a female vole gives birth to a litter of three to eight pups weighing just 1.0-3.1 g. Those newborns can become pregnant as early as the 13th day after they are born, meaning the first litter of a new generation may appear when the young is only 33 days old. This rapid maturation allows individuals to produce several litters within the breeding season that runs from March to October, typically three cycles per female.
• Common voles live on average only 4.5 months, so most individuals die after the final breeding bout in October. The offspring born late in the year are the ones that survive the winter, emerging in spring to join the new breeding cohort. Because the breeding period extends from March to October, a female typically experiences three reproductive cycles before the end of her short life.
• Vole numbers can fluctuate dramatically, falling to about 100 individuals per hectare in lean years and soaring above 2 000 per hectare when conditions are favourable. When densities climb, females often reduce or even halt reproduction, a self-regulatory response that helps curb further population growth. These density-dependent changes are linked to food availability and light conditions, which together shape the vole's reproductive output.
• At birth the common vole shows an equal sex ratio, but as individuals mature or population density rises the balance shifts dramatically toward females, sometimes reaching three or even four females for every male. This female bias intensifies competition for mates because only a few males are available. The heightened scramble for partners drives higher male mortality and prompts many males to leave their original area in search of new females.
• Common voles practise a polygynous mating system, so males do not defend territories but wander as "floaters" through several female home ranges to maximise mating opportunities. Male home ranges are much larger, covering 1200-1500 m² compared with 300-400 m² for females, and both shrink when density increases. Because males compete for limited females, they frequently disperse from their original habitat, a movement pattern driven chiefly by mate competition.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Common Vole

In the whispering grasslands, a tiny, unassuming sovereign weaves its way through the undergrowth, the common vole a paragon of industry and stealth as it navigates its hidden realm with twitching whiskers and darting glances. With each delicate step, the vole's soft paws barely disturb the rustling blades, allowing it to move unseen, a phantom of the meadow, as it pursues its relentless quest for seeds, roots, and tender shoots. As the seasons unfold, this diminutive creature plays a vital, if unsung, role in shaping the very fabric of its ecosystem, its humble existence a testament to the beauty of adaptation and resilience.

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