Natterjack Toad

The Natterjack Toad

The Natterjack toad (Epidalea calamita) is one of Britain’s rarest amphibians and a distinctive member of the toad family.

Smaller and more lightly built than the common toad, it is best known for the bright yellow stripe running down the centre of its back and also for its rasping, far-carrying call of the males during the breeding season.

In the UK, the species has a restricted distribution and is the focus of significant conservation efforts.

Identification and Physical Characteristics

Adult natterjack toads typically measure 6–7 centimetres in length, making them noticeably smaller than the common toad.

Their skin is warty and olive or greyish-green, often patterned with darker blotches. But the most reliable field mark is the narrow yellow line that runs along the spine (although this stripe can sometimes be faint).

Another distinctive feature the natterjack has is its relatively short hind legs. As a result, it does not hop in long leaps but instead moves in quick, purposeful runs.

This running behaviour, combined with its preference for open habitats, makes it easier to distinguish from other British amphibians.

Habitat and Distribution in the UK

In Britain, natterjack toads are found primarily in three types of habitat:

Coastal sand dunes (particularly in north-west England)

Lowland heaths

Upper saltmarshes

Historically, the species was more widespread, but habitat loss and changes in land use have caused severe declines.

Today, populations are concentrated in parts of north-west England, the Solway Firth region in south-west Scotland, and a few heathland sites in southern England.

Natterjacks favour open, sparsely vegetated landscapes with sandy soils. They rely on shallow, temporary pools for breeding—water bodies that warm quickly in spring and are often free from fish and major predators. These ephemeral pools are essential for successful reproduction.

Breeding and Life Cycle

The breeding season usually begins in April and can continue on into June, depending on weather conditions.

Males gather at shallow pools and produce a loud, rasping call that can be heard over a kilometre away on still nights. This call is one of the most distinctive sounds of Britain’s coastal dunes in spring.

Females lay long strings of spawn, which are wrapped around submerged vegetation.

Tadpoles develop rapidly in the warm, shallow water, often completing metamorphosis within six to eight weeks. The speed of development is crucial, as many of the breeding pools dry out during summer.

Juvenile toads, known as toadlets, emerge in large numbers and disperse into surrounding habitat. However, survival rates are low, and only a small proportion reach adulthood.

Diet and Behaviour

Natterjack toads are nocturnal hunters. They feed mainly on small invertebrates such as beetles, ants, flies, and spiders. Their hunting strategy involves short bursts of movement followed by stillness, allowing them to ambush prey.

Outside of the breeding season, they shelter in burrows, under stones, or in sandy scrapes. During winter, they hibernate below ground to avoid the freezing temperatures.

Conservation Status and Protection

The natterjack toad is legally protected in the UK under national wildlife legislation.

It is also listed under international conservation agreements due to its vulnerability.

Conservation measures focus on:

Creating and maintaining shallow breeding pools

Managing vegetation to keep habitats open

Preventing the loss of dune and heathland systems

Monitoring populations and supporting reintroduction projects

Active habitat management has helped stabilise some populations, but the species remains dependent on continued conservation work.

Ecological Importance

As both predator and prey, the natterjack toad plays an important role in its ecosystem.

It helps regulate insect populations and serves as food for birds, mammals, and reptiles. Its reliance on early-successional habitats also makes it an indicator species for the health of dynamic coastal and heathland environments.

Conclusion

The natterjack toad is a unique and quite charismatic amphibian of the British landscape.

Recognisable by its yellow dorsal stripe and distinctive call, it thrives in specialised habitats that are increasingly rare.

Ongoing conservation efforts are essential to ensure that this remarkable toad continues to inhabit the UK’s dunes and heathlands for generations to come.

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