Cane toad

The cane toad is a very large toad.

It has dry and bumpy skin. It lives in warm lands like South America.

This toad can be a pest. People brought them to new places to eat bugs.

But the toad is also dangerous. It has poison glands behind its eyes. If an animal eats the toad, it can get very sick.

Even the tiny black eggs are poisonous.

These toads eat almost anything. They eat bugs, small birds, and even pet food. They are very good at finding food. They use their eyes and their sense of smell.

Female toads lay many eggs at once. They lay thousands of eggs in long strings. The eggs live in the water.

Most young toads do not grow up. Only a few become big adults. It is a very tough life for a toad.

The cane toad is a very large toad.

It comes from South and Central America. These toads have dry and warty skin. They can be many colors like grey or brown.

One special part is the parotoid gland. This is a large gland behind each eye. When a toad is scared, it lets out a milky fluid. This fluid is called bufotoxin. It is a poison that can harm many animals. This includes dogs and even some birds.

Even the tiny black eggs and tadpoles are toxic.

Cane toads are very good at finding food. They use their eyes and their sense of smell. They eat many things like bugs, small birds, and even pet food.

Females lay thousands of eggs in long strings of jelly. These eggs hatch into small, black tadpoles in the water. Most young toads do not reach adulthood. Only about 0.5% of them grow up to be big adults. This is because life is very hard for them.

The cane toad is a very large and famous type of toad.

It is native to South and Central America. People often call it the giant neotropical toad or the marine toad. It belongs to a group of animals called the genus Rhinella. This toad matters because it can change the places where it lives. It is now found in many parts of Oceania and the Caribbean. It is also found in Northern Australia.

Life for a cane toad starts in the water as an egg.

A female lays a single clump of thousands of eggs. These eggs are black and covered in a jelly membrane. The eggs hatch into small, black tadpoles within a few days. These tadpoles live at the bottom of the water in groups. They grow into tiny toadlets in about four weeks. Most young toads do not survive to become adults. Only about 0.5% of them reach full size. This is because they face hard jobs like being eaten by siblings.

Humans have a long history with this species.

Carl Linnaeus described the cane toad in his 1758 work, Systema Naturae. He used the name marina because of an old drawing. A scientist named Albertus Seba thought the toad lived in the sea. This was a mistake, but the name stuck. Later, the toad was brought to other lands to help farmers. It was used to control the cane beetle. This beetle eats sugar cane, which is a plant used for sugar. Now, the toad is often called an invasive pest in those places.

There are many interesting facts about how these toads live.

An adult female is much longer than a male. They can live for 10 to 15 years in the wild. One toad even lived for 35 years in captivity! Their skin is dry and has many warts. They have large parotoid glands behind their eyes. These glands make a milky fluid called bufotoxin. This fluid is a poison that can harm many animals. This includes dogs and even some birds.

Cane toads are very good at finding food to eat. They use their eyes to see movement. They also use their sense of smell to find things. They have a very large diet for a toad. They eat bugs like ants, beetles, and dragonflies. They also eat small mammals, birds, and even bats. Some toads will even eat pet food or household trash. This ability to eat almost anything helps them live in new places. They can even survive in places that are not very tropical. They can handle losing a lot of water in their bodies.

The cane toad, scientifically known as *Rhinella marina*, is a massive terrestrial toad. It is a member of the genus *Rhinella*, which includes many true toad species from Central and South America.

While native to the neotropics, it has been introduced to many islands in Oceania, the Caribbean, and Northern Australia. This species is highly significant because it is a prolific breeder and an opportunistic feeder. These traits allow it to spread rapidly and become an invasive species in new environments. Because it can adapt to many different habitats, it poses a major challenge for local ecosystems.

The life cycle of the cane toad begins in the water. A female lays a single clump of eggs that can contain between 8,000 and 25,000 eggs.

These black eggs are held together by long strings of jelly that can reach 12 meters in length. Within 14 hours to one week, the eggs hatch into small, black tadpoles. These tadpoles are bottom-dwellers that often form large schools. As they grow, they undergo metamorphosis to become toadlets. This process typically takes about four weeks, but it can take up to 60 days. Only about 0.5% of these individuals actually reach adulthood. This low survival rate is partly due to tadpole cannibalism, which is much more common in Australian populations than in South American ones.

Adult cane toads have very distinct physical features. They are considered the largest species in the family Bufonidae.

Females are significantly larger than males, often reaching much greater snout-vent lengths. Their skin is dry and covered in warts. One of their most important features is the large parotoid gland located behind each eye. These glands are responsible for producing a milky-white fluid called bufotoxin. When a toad feels threatened, it secretes this toxin as a defense. The toxin is highly dangerous to many animals, including dogs and various wild species.

The history of the cane toad is tied to human agricultural efforts. The common name comes from its use as a method of pest control. Farmers introduced the toads to combat the cane beetle, *Dermolepida albohirtum*, which damages sugar cane crops. However, the toads did not just eat the beetles; they became a widespread problem themselves. The 1988 film *Cane Toads: An Unnatural History* documented the difficulties caused by their introduction to Australia. Today, the toad is widely classified as an invasive pest in many of the regions where it was once introduced for help.

Taxonomy for this species has changed over time due to scientific discovery. Carl Linnaeus first described the species in 1758 in his work *Systema Naturae*.

He used the specific name *marina* based on an illustration by Albertus Seba. Seba mistakenly believed the toad lived in both land and marine environments. Later, scientists moved the species from the genus *Bufo* to *Rhinella*. This change required adjusting the name to *Rhinella marina* to follow the rules of gender agreement in zoological nomenclature. Some researchers also consider populations in Mesoamerica to be a separate species called *Rhinella horribilis*.

Cane toads are incredibly successful because of their unique biology. They can survive in many different climates thanks to physiological plasticity.

This means they can adjust their tolerance to temperature changes within just a few hours. They also have a very high tolerance for water loss, surviving even if they lose 52.6% of their body water. Their diet is also unusually broad for anuran species. They eat living prey like birds, bats, and small mammals, but they also eat dead matter, feces, and even household refuse. This ability to find food almost anywhere helps them dominate new landscapes.

Understanding the cane toad genome is a major goal for modern science.

By sequencing their DNA, academics hope to learn how they evolve so quickly in new environments. They also want to understand how their toxins work. This research might eventually lead to new ways to stop the toad from spreading. The study of this species connects biology, ecology, and even human history. It shows how a single animal can change the balance of an entire continent's ecosystem.