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Beaver

(Castor fiber)

Beavers are the engineers of the animal world, creating wetlands where wildlife can thrive. After a 400-year absence, Beavers are back in Britain!

Beaver © Nick Upton
Beaver © Nick Upton
Beaver © David Parkyn
Beaver © David Parkyn
Beaver enclosure from the air © Matt Phelps / Knepp Wildlands
Beaver skull © Fran Southgate
Signs of Beaver activity at Knepp Estate pond in winter Signs of Beaver activity at Knepp © Sophie Atkinson

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Memberships builds our community and gives us a predictable income, which lets us plan and sustain longer projects that can have a greater impact. The more members we have, the more we can do to protect the Sussex countryside and coast.

Make a donation

Membership builds our community and gives us a predictable income, which lets us plan and sustain longer projects that can have a greater impact. The more members we have, the more we can do to protect the Sussex countryside and coast.

Overview

Beavers, our largest rodents, are known as a keystone species – one that plays a critical role in creating thriving ecosystems from which a wealth of wildlife benefits. By creating dams, making ponds, and forming canals to swim around their territory, beavers create habitat that helps lots of other wildlife to thrive.

Ecosystem engineers

Beavers create rich wetland habitats

Herbivores

They feed on plant material (and they don’t eat fish)

Protected

Beavers are protected by law in England

Key facts

  • Strong swimmers
    Beavers are slow on land but excellent swimmers, so they feel safest when they’re close to deep water (around 70cm deep). If the water isn’t deep enough for them, Beavers can make it deeper. They use mud, wood, and stones to build dams across shallow rivers, streams and ditches.
  • Pairs for life
    Pairs usually stay together for life. Breeding takes place between December and April and the pregnancy lasts for 103-108 days. Females give birth to their litter of 1-6 young in early summer (the average litter is two or three young). The young, called kits, can breed at two years old, but don’t tend to breed successfully until they’re at least three.
  • Plant-based diets
    Beavers are herbivores, feeding entirely on plants. In summer, they prefer pond weeds, grasses, leaves and other parts of plants. In winter they eat the bark of trees, favouring willows, poplars and Alder.
  • Colourful teeth
    Beavers have iron in the enamel on their teeth, which gives them extra strength for gnawing through wood, as well as making them a distinctive orange colour. 
  • Dawn and dusk
    Beavers are crepuscular, meaning they are most active at dawn and dusk.
  • Flood defenders
    Beaver dams can prevent flooding further down the river, keep water flowing during droughts, and even filter the water passing through them to reduce pollution.

Status

Beavers were once found throughout Britain, but were hunted to extinction in the 16th century for their fur, meat, and the oil in their scent glands, which was used in medicine and even perfumes.

Now Beavers are back! Thanks to the work of The Wildlife Trusts and other conservation charities, Beavers are being re-introduced into different parts of the UK. Many Wildlife Trusts, including Sussex, are running projects with the ambition that one day Beavers will be widespread in the wild once more.

Seasonality

Beavers do not hibernate, and are active all year round. It’s easiest to catch sight of a Beaver during the spring and summer months, when they emerge before darkness falls.

aerial view Knepp beaver enclosure Aug 2026 2Beaver enclosure from the air © Matt Phelps / Knepp Wildlands

Engineers assemble

Find out how Sussex is bringing back Beavers

With drought, flooding and pollution high on the list of challenges for our county, the race is on to restore Beavers to our catchments.

Discover species that call Sussex home

More than 10,000 species of plants, animals, birds, insects and invertebrates call our nature reserves home. From bats to beetles, orchids to oaks, and butterflies to birds of prey, there’s an impressive diversity of life to discover and experience across the habitats of Sussex.

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As a member, you get access to free guided nature walks, magazines about local wildlife, discounts on courses and events, and a guide to our reserves.

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