Hedgehogs: A Secret Life

The Secret Life of the Hedgehog

The European hedgehog is one of Britain’s most recognisable wild mammals — a small, nocturnal wanderer wrapped in a coat of spines. 

Once a common sight in gardens, fields and hedgerows across the country, this charming insect-eater has become a symbol of both rural nostalgia and modern conservation concern.

A Familiar but Fascinating Mammal

Roughly the size of a small melon, the European hedgehog weighs between 600g and 1.2kg, depending on the season. 

Its most distinctive feature — around 5,000–7,000 stiff spines — is actually made of modified hairs composed of keratin. 

When threatened, powerful back muscles contract to roll the hedgehog into a tight, prickly ball, protecting its vulnerable face and belly.

Though often perceived as slow, hedgehogs can travel over a mile in a single night while foraging. They rely heavily on smell and hearing, snuffling through undergrowth in search of beetles, caterpillars, earthworms and other invertebrates.

Life in the British Landscape

Historically, hedgehogs thrived in the patchwork countryside of the UK — a mosaic of hedgerows, small fields, woodland edges and meadows. 

These environments provided both shelter and abundant insect life. However, modern land use changes have reshaped that landscape.

Today, hedgehogs are found in:

• Suburban gardens

• Parks and churchyards

• Farmland margins

• Woodland edges

• Coastal grasslands

Interestingly, urban and suburban areas have become increasingly important refuges. 

Gardens connected by small gaps in fences — often called “hedgehog highways” — allow individuals to roam safely between feeding and nesting sites.

Nocturnal Habits and Seasonal Rhythms

Hedgehogs are nocturnal and creatures of the night. 

At dusk, they emerge from nests built of leaves and grass, tucked beneath shrubs or sheds. 

Their nightly routine revolves around feeding — especially in late summer and autumn, when they must build fat reserves for hibernation.

In a typical night of foraging, an adult hedgehog usually consumes roughly 40–100 grams of food, mostly invertebrates. 

When slugs and snails are abundant, that can translate to about:

~10 to 50 slugs and snails per night in many garden or woodland-edge situations

Sometimes more (up to ~70–100 small slugs) if conditions are very slug-rich

Hedgehogs eat fewer snails than slugs, because snails are harder to handle due to their shells.

It’s also worth clearing up a common myth: hedgehogs do not specialize in eating slugs and are not an “anti-slug machine.” 

Slugs are just one part of a broader diet that also includes beetles, caterpillars, worms, and other invertebrates—often those are actually more important nutritionally.

The Spines

Each spine is:

• Hollow or partly hollow, which reduces weight while maintaining strength

• Tapered and sharp at the tip for deterrence

• Embedded in a muscle-controlled base that allows slight movement

The spines are not permanent; they are gradually replaced over time, similar to how hair sheds and regrows.

How they work as protection

The key feature is not just the spines themselves, but the muscular system underneath them. 

When threatened, hedgehogs contract a ring of muscles called the panniculus carnosus, which:

• Pulls the skin tight around the body

• Lifts and angles the spines outward

• Helps the hedgehog curl into a tight ball

In this defensive posture, the head, limbs, and soft belly are completely hidden, leaving only a dense, sharp barrier exposed.

Function in defence

The spines work primarily as a passive anti-predator system:

• They make it painful or difficult for predators like foxes or badgers to bite

• They discourage prolonged attacks by making the hedgehog an awkward, prickly object to handle

They are especially effective against medium-sized predators that rely on grabbing or shaking prey.

However, some predators (notably badgers) have adapted techniques to unroll hedgehogs, so spines are not foolproof protection.

Development and variations

Young hedgehogs (hoglets) are born with soft, white spines beneath the skin, which emerge within hours after birth. 

These are gradually replaced with stronger, pigmented adult spines as they grow.

Colour patterns vary slightly between individuals, typically showing banded light and dark sections along each spine, which may help with camouflage in dappled environments.

Overall, hedgehog spines are a highly specialised form of modified hair that combines lightweight construction, replaceability, and a mechanical defence system that works best when paired with their tight defensive curling behaviour.

How badgers unroll hedgehogs

When a hedgehog curls into a tight spiny ball, most predators give up. 

Badgers, however, are one of the few that regularly succeed in “unrolling” them.

How it does it

1. Forcing movement Badgers often start by nudging, rolling, or pushing the hedgehog repeatedly with their snout or forepaws. 

They don’t usually try to bite immediately because the spines make that risky.

2. Clawing and digging A key advantage badgers have is their powerful forelimbs and long claws. 

They can:

• Scrape at the ground beneath the hedgehog

• Dig it loose if it’s braced in soil or vegetation

• Flip or rotate it gradually

This is often more effective than trying to “open” it directly.

3. Persistent probing Over time, the hedgehog may tire or slightly relax its grip. 

The badger exploits these brief moments, repeatedly testing for weak points in the curl.

4. Forcing the belly side The hedgehog’s underside is soft and unprotected. Badgers aim to gradually roll or lever the animal so that the belly becomes exposed enough to bite.

Why badgers can do this

The European badger has several advantages:

• Thick fur and loose skin around the face and neck, which helps protect it from spines

• Strong forelimbs for digging and manipulation

• High persistence—it can spend a long time working on a single prey item

• Opportunistic feeding behaviour

Limits of the strategy

Even for badgers, unrolling a hedgehog isn’t always successful. 

Adult hedgehogs in a tight defensive posture can sometimes withstand attempts, especially in open ground where they’re hard to manipulate. 

None-the-less, the badgers nature and problem solving abilities is a true predation threat to hedgehogs.

Hibernation

From roughly November to March (depending on weather), hedgehogs will hibernate. 

Their body temperature drops dramatically, and heart rate slows from around 190 beats per minute to as few as 20. 

During this time, they survive entirely on stored fat.

How long it hibernates

Hibernation usually lasts around 3–5 months, but it is not a continuous deep sleep. 

Hedgehogs enter a state of torpor, where their body temperature, heart rate, and metabolism drop dramatically. 

They may wake up every few days or weeks to move nests or briefly feed if conditions allow.

Where it hibernates

Hedgehogs choose sheltered, insulated spots that protect them from cold, damp, and predators. 

Common hibernation sites include:

• Piles of leaves, logs, and branches (especially compost or leaf piles in gardens)

• Dense hedgerows and bramble thickets

• Undisturbed garden corners with natural debris

• Occasionally purpose-built hedgehog houses provided by conservation efforts

The key requirement is a dry, well-insulated structure close to food-rich foraging areas before winter begins.

The hibernation nest

The hedgehog builds a nest called a hibernaculum, usually made from leaves, grass, and other plant material. 

It is carefully packed to trap heat and keep out moisture. A good hibernaculum can significantly improve survival through winter.

Milder winters linked to climate change can disrupt this hibernation cycle, causing hedgehogs to wake more frequently and deplete vital energy reserves.

A Species Under Increasing Pressure

Despite their cultural popularity, hedgehogs in the UK have declined significantly over recent decades. 

Habitat fragmentation, intensive agriculture, road traffic and the loss of hedgerows all contribute to population pressures. Pesticide use also reduces the availability of their invertebrate prey.

Conservation organisations such as People's Trust for Endangered Species and the British Hedgehog Preservation Society monitor populations and encourage public participation in initiatives like Hedgehog Street, which promotes wildlife-friendly gardening.

The species is now listed as Vulnerable to extinction in Great Britain.

Globally, it is classified by the IUCN as Least Concern, meaning the species is not currently at risk of extinction worldwide. 

However, in the UK its situation is much more serious.

In Britain, hedgehog populations have undergone significant declines over recent decades—particularly in rural areas, where long-term monitoring suggests drops of 50% or more since the early 2000s, with even steeper historical declines since the mid-20th century in some regions. 

Because of this, it is considered a priority species for conservation in the UK.

It is on the UK Red List of mammals, and generally assessed as Vulnerable in Great Britain, reflecting the ongoing decline and habitat pressures.

How to Help Hedgehogs in the UK

Supporting hedgehogs doesn’t require vast countryside — even small actions can make a difference:

Cut a 13cm x 13cm hole at the base of garden fences to create access routes

Leave areas of wild growth for nesting

Avoid slug pellets and pesticides

Provide shallow dishes of fresh water (never milk)

Check long grass before mowing

Creating a mosaic of safe, connected green spaces helps hedgehogs move, feed and breed successfully.

A Quiet Companion of British Nights

The European hedgehog has shared Britain’s fields and gardens for thousands of years. 

Its soft snuffling presence at dusk connects modern life to a wilder past. Whether glimpsed crossing a lawn or rustling beneath autumn leaves, this small mammal remains a powerful reminder that even ordinary neighbourhoods can host extraordinary wildlife.

Protecting hedgehogs is not only about conserving a species — it’s about restoring the living networks that make the British landscape thrive.

Learn more about:

Nocturnal animals

Badger

Snails