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Common toad

life science Maturity 7-9 Next article →

The common toad, scientifically known as *Bufo bufo*, is a widespread amphibian.

Common toad Bufo bufo multiple amplexus mating ball
Common toad Bufo bufo multiple amplexus mating ball

It is found throughout most of Europe, western North Asia, and parts of northwest Africa. This species is part of a species complex, which is a group of closely related species that are difficult to separate clearly. The common toad plays a vital role in its ecosystem as a predator of many invertebrates. While it is currently classified as "least concern" on the IUCN Red List, it faces local threats. These threats include habitat loss from draining breeding grounds and deaths during seasonal migrations on roads.

Toad tunnel
Toad tunnel

To understand the common toad, one must look at its unique physical traits. The toad has a broad head and a squat body that sits close to the ground. Its skin is dry and covered in small, wart-like lumps. A key feature is the paratoid glands located just behind the eyes. These glands are positioned obliquely, meaning they sit at an angle. They produce a noxious substance called bufotoxin, which serves as a chemical defense. When a predator attacks, the toad may adopt a defensive posture by inflating its body.

Bufo bufo-defensive reaction1
Bufo bufo-defensive reaction1

It raises its hindquarters and lowers its head to appear more intimidating.

This chemical defense is highly effective against many animals, but not all. Most predators avoid the foul-tasting bufotoxin, but the grass snake is an exception.

Užovka obojková s úlovkem (04)
Užovka obojková s úlovkem (04)

Other predators include hedgehogs, rats, and even certain birds like crows. Interestingly, some crows have been observed puncturing the skin to eat the liver specifically to avoid the toxin. In the water, tadpoles also secrete noxious substances to deter fish. However, great crested newts are not deterred by these secretions. Even aquatic invertebrates like dragonfly larvae can bypass these defenses by puncturing the tadpole's skin.

The life cycle of *Bufo bufo* is divided into three distinct periods. The first is the winter sleep, or hibernation. The second is the mating period, which occurs in the spring.

Amplexus Bufo bufo 2010-03-29
Amplexus Bufo bufo 2010-03-29

During this time, large numbers of toads migrate to specific breeding ponds. The third period is the feeding period. Females lay eggs in gelatinous strings in the water.

Bufo.bufo.eggs
Bufo.bufo.eggs

These eggs hatch into tadpoles, which undergo metamorphosis to become tiny toads. After several months of development, the juveniles sprout limbs and leave the water. They remain largely terrestrial for the rest of their lives.

Taxonomy, the science of naming and classifying organisms, has a long history with this species. In 1758, the Swedish biologist Carl Linnaeus first named it *Rana bufo*. At that time, he placed all frogs and toads into the single genus *Rana*. In 1768, the Austrian naturalist Josephus Nicolaus Laurenti moved the species to the genus *Bufo*. This placed them in the family Bufonidae, known as the true toads. Scientists have since identified various subspecies and related species. For example, the spiny toad (*Bufo spinosus*) was once considered a subspecies but is now its own species.

Common toad Bufo bufo multiple amplexus mating ball
Common toad Bufo bufo multiple amplexus mating ball

Evolutionary studies provide a timeline for how these species diverged. A study from 2012 examined the phylogenetic relationships of the *Bufo bufo* group. It suggests a long evolutionary history spanning millions of years. About nine to thirteen million years ago, *Bufo eichwaldi* split from the main lineage. The spiny toad split off approximately five million years ago during the uplift of the Pyrenees. This geological event isolated populations in the Iberian Peninsula. Finally, the European lineage split into *Bufo bufo* and *Bufo verrucosissimus* less than three million years ago during the Pleistocene epoch.

The common toad is a highly efficient hunter that uses visual cues to find food. It is voracious, eating woodlice, slugs, beetles, caterpillars, flies, ants, spiders, and earthworms. It can even consume small mice. Because it has no teeth, it swallows prey whole in a series of gulps. It can see its prey in low light levels that are much lower than what humans can see. In the wild, these toads typically live for ten to twelve years. However, they have been known to survive for fifty years in captivity. You can determine a toad's age by counting the annual growth rings in the bones of its phalanges, which are the toe bones.

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🖼️ Images & Media (14)
Common Toad (Bufo bufo) (W BUFO BUFO R3 C2).ogg
File:Toad shoulder girdle.jpg
Toad shoulder girdle.jpg
File:Bufo bufo-defensive reaction1.JPG
Bufo bufo-defensive reaction1.JPG
File:Užovka obojková s úlovkem (04).jpg
Užovka obojková s úlovkem (04).jpg
File:Bufo bufo w Bialogard Polen 080901 (1).jpg
Bufo bufo w Bialogard Polen 080901 (1).jpg
File:Amplexus Bufo bufo 2010-03-29.jpg
Amplexus Bufo bufo 2010-03-29.jpg
File:Common toad Bufo bufo multiple amplexus mating ball.jpg
Common toad Bufo bufo multiple amplexus...
File:Bufo.bufo.eggs.jpg
Bufo.bufo.eggs.jpg
File:BufoBufoTadpoles.jpg
BufoBufoTadpoles.jpg
File:Tadpole 2A.JPG
Tadpole 2A.JPG
File:Toad tunnel.jpg
Toad tunnel.jpg
File:Satan-traditional-arms.svg
Satan-traditional-arms.svg

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