Green and golden bell frog facts for kids
Quick facts for kids Green and golden bell frog |
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| Conservation status | |
Scientific classification  |
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Amphibia |
| Order: | Anura |
| Family: | Pelodryadidae |
| Genus: | Ranoidea |
| Species: |
R. aurea
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| Binomial name | |
| Ranoidea aurea (Lesson, 1829)
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| Synonyms | |
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Litoria aurea (Günther, 1864) Fanchonia elegans Werner, 1893 |
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The green and golden bell frog (Ranoidea aurea) is a special frog from eastern Australia. You might also hear it called the green bell frog or green frog. Even though it's a type of tree frog, it mostly stays on the ground. These frogs can grow quite large, up to about 11 cm (4.5 in) long, making them one of Australia's biggest frogs!
These frogs are easy to spot with their bright gold and green colors. They love to eat insects, but they can also munch on bigger snacks like worms. They are often active during the day, especially when they want to warm up in the sun. In winter, they slow down, but they become busy again in warmer months to find mates. Young males are ready to breed around 9 months old, while females take a bit longer, usually two years. Sometimes, these frogs might even eat smaller frogs, including their own kind. Males can also get into fights if another frog gets too close to their space.
Sadly, the green and golden bell frog used to be very common, but its numbers have dropped a lot. This is especially true in higher areas of Australia. Now, it's considered an endangered species worldwide. Many things threaten them, like losing their homes, pollution, new animals brought into their areas, and diseases. Interestingly, some populations introduced to New Zealand and other Pacific islands have done better, but even there, their numbers have been falling recently. Many of the remaining frogs in Australia live on private land, which makes protecting them a bit tricky.
Contents
- Frog Family Tree: How Scientists Name Frogs
- Where Do Green and Golden Bell Frogs Live?
- What Does a Green and Golden Bell Frog Look Like?
- Daily Life and Habitat of the Green and Golden Bell Frog
- What Do Green and Golden Bell Frogs Eat?
- Who Eats the Green and Golden Bell Frog?
- Green and Golden Bell Frog Life Cycle and Reproduction
- Protecting the Green and Golden Bell Frog
- See also
Frog Family Tree: How Scientists Name Frogs
The name "green and golden bell frog" became popular in 1975. Before that, people called it the "golden frog" or "golden tree frog."
Scientists first described this frog in 1827, giving it the name Rana aurea. Aurea is a Latin word meaning 'golden'. Over time, scientists learned more about frogs and changed its classification several times. They noticed it looked a lot like frogs in the Rana group, with a pointy nose, long legs, and webbed toes. It also spent a lot of time in water, just like many Rana frogs.
However, after looking closely at its bones and cartilage, they realized it was actually more similar to frogs in the Hylidae family. So, it was moved to a new group, and its scientific name became Ranoidea aurea.
Meet the Ranoidea aurea Frog Group
The green and golden bell frog belongs to a group of closely related frogs called the Ranoidea aurea complex. This group includes several other bell frogs found across Australia. Some of these, like the growling grass frog and the yellow-spotted bell frog, live in the same areas as the green and golden bell frog. Because they look so similar, it can be hard to tell them apart! For a long time, the growling grass frog and the green and golden bell frog were even thought to be the same species until 1972, when studies showed they were different.
Scientists have studied these frogs to understand how they are related. They believe the green and golden bell frog separated from its closest relatives about 1.1 million years ago. Even though their living areas overlap, and they sometimes share ponds, there isn't much evidence of them mixing or having babies together in the wild.
Where Do Green and Golden Bell Frogs Live?
These frogs originally lived in southeastern Australia. Their home range once stretched from northern New South Wales down to Victoria, and inland towards Bathurst.
Sadly, their population has shrunk a lot. Today, you'll mostly find them along the coast, from Byron Bay in New South Wales to East Gippsland in Victoria. Since the 1960s, their numbers in New South Wales have dropped sharply. They have almost disappeared from areas higher than 250 m (820 ft). A 1996 study found only about six large groups of over 300 frogs left. Today, they are found in only about 40 places, with many of these in the Sydney area. It's estimated that 90% of their original homes are now empty of these frogs. In Victoria, the decline has been less severe, mainly affecting inland areas where their habitats vanished.
Frogs in Sydney and Beyond
Some green and golden bell frogs still live in parts of Sydney. For example, a population was found at the Brickpit in Sydney Olympic Park. This discovery was so important that the tennis courts planned for the 2000 Sydney Olympics were built elsewhere to protect the frogs! This frog has even become a special symbol for the Homebush Bay area.
These frogs also live on three islands off Australia's east coast. Interestingly, they were brought to New Zealand in the 1860s and are now common in some parts of the North Island. They were also introduced to New Caledonia and Vanuatu in the 19th century and have thrived there. However, even in these new homes, their numbers have started to decline recently, possibly due to fish that eat them.
Scientists haven't found big differences in how these frogs look or their size in different places. Female frogs tend to spend more time away from breeding spots than males. Young frogs are seen less often than adults, but scientists aren't sure if this means there are fewer of them or if they are just better at hiding.
What Does a Green and Golden Bell Frog Look Like?
The green and golden bell frog is a big, strong frog. Adults are usually 4.5 to 11 cm (1.8 to 4.3 in) long, with most being around 6 to 8 cm (2.5 to 3 in). This makes it one of Australia's largest frogs! Male frogs are usually smaller than females.
Their colors can vary a lot. They can be almost entirely green, from dark pea-green to bright emerald. Some are green with shiny, metallic gold or bronze spots. Others might be almost completely bronze. Females generally have more green patches than males. When it's cold, or if they stay in a dark place, their color can get much darker, almost black. Their color can also change as they grow older.
Distinctive Markings
A creamy-white or pale yellow stripe runs from behind their eye, over their ear (called a tympanum), all the way to their hip. This stripe has a gold border above it and a black border below. Another similar stripe goes from below the eye to the shoulder. Their belly is white or cream and feels a bit bumpy. Their legs can be green, bronze, or a mix of both, and the inside of their thighs and groin are blue-green.
Adult males develop a yellowish color on their throats where their vocal sacs are. Their ears are easy to see and oval-shaped. They have large toe pads that help them climb. Even though they are often in water, their fingers don't have webbing, but their toes are almost fully webbed. During breeding season, males grow special pads on their thumbs to help them hold onto females. These pads turn brown when they are breeding. Females' feet can turn bluish, and males' legs become rusty orange during this time.
Daily Life and Habitat of the Green and Golden Bell Frog
These frogs, part of the tree frog family, love to bask in the sun. You'll often find them on plants, rocks, or reeds, usually near water. Unlike most frogs, they are often active during the day. If you pick one up, it might release a slippery, strong-smelling mucus. This mucus contains special chemicals that act like antibiotics and can even fight cancer cells! It also makes the frog hard to hold and can be harmful to other frog species, making it a great defense. Male frogs sometimes fight if they get too close to each other, which can lead to injuries.
Green and golden bell frogs live in many different places. They are often found in coastal swamps, wetlands, and small rivers. But they have also been seen in surprising spots like old industrial areas, brick pits, and even bathtubs! They prefer still, shallow, unshaded, and clean freshwater ponds. They try to avoid water with fish that might eat them. They especially like water bodies with plants like reeds, where they can bask in the sun. In winter, they find shelter in nearby plants, rocks, or even human-made debris. They also like grassy areas nearby for hunting.
Frog Journeys and Survival Skills
These frogs can travel quite far, sometimes moving 1 to 1.5 kilometers in a single day or night. Some have even been tracked moving up to 3 kilometers! However, they usually prefer to stay in one good spot if the habitat remains suitable. They are well-equipped for life on land. They can soak up water through their skin to stay hydrated, and they don't lose much water through evaporation. Some frogs have been seen as far as 400 meters from any water source.
During winter, they become less active and stay in one place. In warmer months, they move around more to find food and mates. They might become active for short periods in winter if the weather is warm or wet. Scientists think they might hibernate in cold conditions, but more research is needed. While they are active during the day, they mostly sunbathe and only hunt insects if they come very close.
The frog's breeding depends on how salty the water is and its temperature. Tadpoles develop best in water that is around 20°C or warmer. They can handle a little salt in the water, which can even help kill harmful fungi. However, too much salt can slow their growth and increase deaths. The water's acidity (pH) doesn't seem to affect whether the eggs hatch, as long as it's not too acidic.
What Do Green and Golden Bell Frogs Eat?
Adult green and golden bell frogs are very hungry eaters! Their diet includes many insects like crickets, mosquito larvae, dragonflies, earthworms, and grasshoppers. They also eat freshwater crayfish, slugs, and even other frogs, sometimes even their own kind. It happens in the wild, especially if there are many frogs in one area.
Tadpole Meals
Young tadpoles eat tiny bits of dead plants and animals (detritus), algae, and bacteria. Older tadpoles might prefer plant matter, but they will also scavenge for other aquatic life. If there are too many tadpoles in one pond, they might also eat each other.
In zoos, these frogs have been seen eating crickets, flies, beetles, worms, spiders, and even small mice. They usually only respond to food that moves, which suggests they hunt by sight.
Hunting Habits
How frogs hunt changes as they grow. Smaller, younger frogs tend to catch small, flying insects, often jumping to grab them. Adult frogs prefer larger insects found on land and other frogs. They also eat aquatic prey like tadpoles. Young frogs that have just changed from tadpoles have been seen going into shallow water to catch mosquito larvae.
Frogs eat less during cooler parts of the year. Wild frogs also eat less during breeding season. Younger frogs tend to forage for food longer into the warmer months to build up their energy stores before winter.
Who Eats the Green and Golden Bell Frog?
Many animals prey on green and golden bell frogs. Wading birds like egrets, herons, and ibises are common predators. Snakes, skinks, red foxes, tortoises, and even eels and other fish also hunt them. Some insects, like the large brown mantis, can also be predators.
Adult frogs have been eaten by red-bellied black snakes, tiger snakes, kookaburras, and kingfishers. Other snakes, like the green tree snake, are also thought to be predators. We don't know exactly how much each of these predators affects the frog population. Long ago, Aboriginal Australians sometimes hunted and ate these frogs. They were also caught by people for biology classes or to feed pet reptiles.
Green and Golden Bell Frog Life Cycle and Reproduction
Green and golden bell frogs breed in the warmer months, usually from October to March. However, some breeding has been seen earlier in late winter. The timing of breeding can depend on where the frogs live. Frogs in southern and higher areas seem to have a shorter breeding season than those in northern and lower areas.
During breeding season, male frogs call out, usually while floating in the water, but sometimes from plants at the edge of a pond. They mostly call at night with a deep, growling sound that sounds like a motorbike changing gears. Other males will respond to these calls, and sometimes whole groups will call together. Males are more likely to call when the water temperature is between 16–23°C and the air temperature is 14–25°C. Calling also happens more often right after it rains.
Growing Up and Mating
Males become ready to breed when they are about 9 to 12 months old and around 4.5–5 cm long. At this size, a yellowish color appears under their chin, showing their vocal sac is developing. Females become sexually mature at two years old. They need to be at least 6.5 cm long before they can mate. These frogs don't just breed once; they can have babies multiple times in their lives. Females can lose a lot of weight when laying eggs, and males also lose weight during breeding because they eat less. They usually regain this weight between January and September.
Mating, called amplexus, usually happens in the water, but sometimes on dry land. Males will grab onto the female's back near her armpits. In the wild, this can last from 10 minutes to five days. Sometimes, mating doesn't result in eggs being laid.
Eggs and Tadpoles
The frogs might move up to 100 meters while mating before the female lays her eggs. During egg-laying, the male stays with the female and fertilizes the eggs. Males have been seen paddling their back legs, which might help with fertilization. This whole process takes about five minutes.
A female lays an average of 5,000 eggs in a jelly-like mass among water plants. One frog was even recorded laying over 11,000 eggs! The eggs are laid in a trail that sometimes gets tangled. At first, the egg mass floats, but it sinks after a few hours or if disturbed. The eggs are unique: they are 2–2.5 mm wide, black at one end and white at the other. They quickly grow to about 4 mm before sinking.
Tadpoles hatch out of the eggs in two to five days, though sometimes it can happen in just a few hours. The hatching rate is best at 22°C. Since so many eggs hatch but there are few adult frogs, scientists believe that most tadpoles don't survive.
Tadpole Development
When they first hatch, tadpoles are tiny, about 2.5–3 mm long (not including the tail). They grow quickly, tripling in length in about 10 weeks. Green and golden bell frog tadpoles can become quite large, up to 80 mm (3.1 in), but their size varies a lot. Their bodies are usually as wide as they are deep, and their fins have a yellow tint. Just before they grow legs, the tadpoles start to turn green, like the adult frogs.
Tadpoles usually swim near the water surface or rest at the bottom. They often swim together in groups, like schools of fish. The tadpole stage usually lasts between 10 and 12 weeks, but it can be as short as five weeks or as long as a year. Tadpoles that grow slower often continue developing through winter. Growth is faster in warmer temperatures.
Metamorphosis: From Tadpole to Frog
Towards the end of the tadpole stage, hind legs appear, followed by front legs. This change usually happens between October and April. However, tadpoles have been seen all year round, meaning some might spend the winter as tadpoles. Once all limbs are developed, the tadpole's tail gets absorbed, and its breathing hole closes. This process is called metamorphosis.
Metamorphosing tadpoles are typically 2.2–2.8 cm long. The full metamorphosis takes between two and 11 months, depending on water temperature and food. It usually takes three to eight days after the tadpole stage is complete. Breeding is much more successful in ponds without predatory fish and in temporary ponds that dry up sometimes.
Young frogs that have just completed metamorphosis are about 2.6 cm (1.0 in) long and look like miniature adults. They often leave the breeding site quickly, especially if there's good hunting nearby. This quick departure might be because larger frogs sometimes eat smaller, developing ones. Young frogs grow fast at first, reaching 4.5 cm in two months, then slowing down after about six months. Once they reach sexual maturity, their growth becomes very slow.
Newly metamorphosed frogs weigh about 2 grams, while the largest adults can reach 50 grams. A frog's weight can change a lot depending on how much fat it has stored, how recently it ate, and if it's a female carrying eggs. In captivity, these frogs can live for 10–15 years, but their lifespan in the wild is not fully known.
Protecting the Green and Golden Bell Frog
The number of green and golden bell frogs has dropped by more than 30% in the last 10 years. It is listed as globally and nationally vulnerable, and as endangered in New South Wales, Australia. However, in New Zealand, where they were introduced, these frogs are common and not protected.
Many things have caused this dramatic decline in Australia. These include losing their homes, soil erosion, water pollution from insecticides and fertilizers, and the introduction of fish that eat them. One big problem is the eastern mosquitofish, which was brought from North America to control mosquitoes. Studies show that this fish loves to eat the eggs and tadpoles of the green and golden bell frog. In many places where the frogs disappeared, these mosquitofish were found. While frogs can live in water with these fish, they rarely have successful breeding there.
Other Threats and Conservation Efforts
Other threats include predators like introduced mammals (cats and foxes), changes in water quality, herbicide use, and the destruction of wetlands. A frog disease called chytrid fungus has also contributed to the decline. Scientists are still trying to figure out how much each of these factors affects the frogs. The frogs' genetic diversity has also become small due to habitat loss, which means smaller groups of frogs are isolated and might be more prone to health issues. Some scientists have suggested mixing frog populations to improve their genetics and survival rates.
Scientists are doing a lot of research and monitoring to help these frogs. They are looking for ways to control the mosquitofish, like poisoning them or introducing their predators. Other strategies focus on improving frog habitats, such as increasing water salinity to protect against chytrid fungus and boosting breeding success. Community awareness programs are also being developed.
One challenge is that only about 20% of the known frog populations in New South Wales are in protected parks. There have been calls for laws to stop habitat damage on private land. Many proposed building projects have faced legal challenges to protect frog habitats, and some communities have formed "Friends of the Green and Golden Bell Frog" groups. Public awareness has grown, with more documentaries and news stories about the frogs. Their national colors (green and gold) have also helped them become a symbol for environmental efforts. Logging restrictions have been put in place near areas where the frogs live. Since these frogs are often found in areas changed by humans, carefully managing these environments might help them thrive.
Captive Breeding and Reintroduction
In 1998, Taronga Zoo in Sydney started a captive-breeding program to help save the declining frog populations in the Sydney area. This program involved breeding wild frogs in the zoo and then releasing many tadpoles back into their natural habitats. They also worked on restoring habitats and monitoring the frogs after release. The program first focused on Botany, where thousands of tadpoles were released. Local community members and even school students helped monitor the frogs, which was a first for endangered species monitoring.
The program has since expanded to other areas. Between 1998 and 2004, tadpoles were released into special ponds at Long Reef Golf Course in Collaroy, but with limited success. Although adult male frogs are sometimes found there, a permanent breeding population has not yet been established. An attempt to reintroduce frogs in Marrickville also failed due to chytrid fungus.
At Homebush Bay, conservation efforts include 10 road underpasses for frogs, over 90 artificial ponds, and 5 kilometers of frog-proof fences to keep them safe from roads. They have even installed bricks with frog-sized holes, which provide warm places for frogs in winter. Frogs using these bricks also receive an antifungal bath to protect them from disease.
See also
In Spanish: Rana campanilla verde dorada para niños
