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Frog -- Development of American Bullfrog Specimen For Sale

Frog -- Development of American Bullfrog Specimen

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Frog -- Development of American Bullfrog Specimen:

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<img border="0"><br><a target="_blank"><img border="0"></a> Frog -- Development of American Bullfrog Specimen

A set of real 8 stages Development of American Bullfrog (Rana catesbeiana)specimen encased in our proprietary developed lucite material. The specimen is crystal clear, indestructible and transparent. Safe,authentic and completely unbreakable specimen put realFrogright at your fingertips! Anyone can safely explore theFrogfrom every angle. It is clear enough for microscope observation.

Size of thelucite block is 13.5x7.5x2.0 cm (5.3x3.0x0.8 inch).

Each one comes with a cardboard box for easy storage. Weight of thelucite block is260 g and470 g with the box.

It is an ideal learning aid for students and kids and also a very good collectible item for every body.

This is a handmade real animal specimen craft. Each one will be a bit different (specimen size, color and posture) even in the same production batch.
The picture in my listing is just for reference as we are selling multiple pieces with the same picture.

I have a lot more animal specimenitems in my you may log in my store to view the details.


1. One Cell Stage 2. Tailbud Stage 3. Tadpole with External Gill

4. Tadpole with Internal 5. Tadpole with Hindlimb

6. Tadpole with Forelimb 7. Tadpole Shortened Tail 8. Froglet

American Bullfrog - Rana catesbeiana

Geographic Range

North American bullfrogs (Rana catesbeiana) are only native to the Nearctic region. They are found from Nova Scotia to central Florida, from the East coast to Wisconsin, and across the Great Plains to the Rockies. The natural western limits of this species are now confused due to their introduction into places as far west as California and Mexico. It is known that bullfrogs were introduced to areas of California and Colorado in the early 1900's. The species has also been introduced (accidentally or on purpose) into southern Europe, South America, and Asia.


North American bullfrogs must live in water and are therefore usually found near some source of water, such as a lake, pond, river, or bog. Warm, still, shallow waters are preferred. Bullfrogs are becoming increasingly common in areas that have been modified by humans. Increased water temperatures and increased aquatic vegetation, which are common factors of lakes polluted by humans, favor bullfrogs by providing suitable habitats for growth, reproduction, and escape from predators.


About four days after fertilization, spotted tadpoles emerge from the floating egg mass. The tadpoles have gills and a tail, which eventually disappears as the tadpole transforms into a froglet. Tadpole development is quite slow; it may take between one to three years to begin transformation from the tadpole stage into the adult stage. Adults reach sexual maturity after an additional two years.


Breeding interval
Bullfrogs breed once each year.

Breeding season
May to July in the north and February to October in the south

Number of offspring
20000 (high)

Gestation period
4 days (average)

Age at sexual or reproductive maturity (female)
3 to 5 years

Age at sexual or reproductive maturity (male)
3 to 5 years

Breeding takes place in May to July in the north, and from February to October in the south. Fertilization is external, with the females depositing as many as 20,000 eggs in a foamy film in quiet, protected waters. Fertilization is usually, but not always, by one male. Tadpoles emerge about four days after fertilization. These tadpoles may remain in the tadpole stage for almost 3 years before transforming into frogs. Adults reach sexual maturity after 3 to 5 years.

Females provide the eggs with yolk before they are laid. There is no parental involvement in offspring after the eggs are laid. Newly hatched tadpoles can take care of themselves right away.

The average bullfrog lives seven to nine years in the wild. The record lifespan of an animal in captivity is 16 years.


North American bullfrogs prefer warm weather and will hibernate during cold weather. A bullfrog may bury itself in mud and construct a small cave-like structure for the winter. Their hunting style is 'sit and wait.' Bullfrogs can wait for a long time for some type of prey to come by, then, with a flash of the tongue, they grab it and bring it back into their mouths. Bullfrogs are active both during the day and at night; they are most active when the weather is moist and warm.

Home Range

Adult males are very aggressive and defend their territories, which can range from 3 to 25 meters of shoreline, by physically wrestling with others.

Communication and Perception

The call of a male bullfrog has a low frequency and can be heard for over one kilometer. The sound is often described as a low rumbling "jug-o-rum". Bullfrogs also have a good sense of vision and sense vibrations.

Food Habits

Bullfrogs are predators. They usually eat snakes, worms, insects, crustaceans, frogs, tadpoles, and aquatic eggs of fish, frogs, insects, or salamanders. They are cannibalistic and will not hesitate to eat their own kind. There have also been a few cases reported of bullfrogs eating bats. Bullfrog tadpoles mostly graze on aquatic plants.


Known predators

great blue heron

great egret

belted kingfisher


water snakes


Humans hunt bullfrogs for frog legs, but they have a limited hunting season in most states. Bullfrogs are also eaten by a wide variety of other animals, depending on the region. These include herons, such as great blue herons and great egrets, turtles, water snakes, raccoons, and belted kingfishers. Most fish are averse to eating bullfrog tadpoles because of their undesirable taste.

Economic Importance for Humans: Negative

Introduced bullfrogs may be driving native frogs to extinction in some areas. Colorado, among many other places, is experiencing problems due to the introduced bullfrog population. Bullfrogs may have been introduced accidentally to trout streams and lakes during the Colorado Divisions of Wildlife fish stocking operations. Bullfrogs occasionally invade fish hatchery ponds and their larvae are caught along with the fishes that are routinely stocked in ponds.

Economic Importance for Humans: Positive

North American bullfrogs help to control insect pests. They are important for medical research because their skeletal, muscle, digestive, and nervous systems are similar to those of other animals. They are often hunted for meat (frog legs).

Conservation Status

Bullfrogs do well with changes in the environment that have occured due to human modification, and are becoming increasingly common in areas modified by humans. Bullfrogs have a much higher critical thermal maximum than most other frogs, meaning that they are able to thrive in higher water temperatures. Bullfrogs have a longer breeding season and a higher rate of pre-metamorphic survivorship, which also allows them to be more successful than other frogs. In some areas, such as California, bullfrogs are driving other frog populations to extinction. One possible reason to explain why bullfrogs in California might have an advantage over other species native to that state is that bullfrogs evolved with a diverse predatory fish fauna in eastern North America. In California there have been attempts to control bullfrog populations by introducing new fish species that are their predators. Bullfrogs have evolved mechanisms to avoid predation by fish, such as less palatable eggs and tadpoles, and tadpoles that are not active much of the time, which reduces their exposure to predators. Native frog species of California are also suffering a decline because bullfrogs are efficient predators of frogs and tadpoles.

Other Comments

Bullfrogs are well known for their enormous legs. They are some of the best jumpers in the world and are used in frog racing in some parts of the United States.


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Goods will be sent by airmail from Hong Kong and it may take 12-18 days to arrive.

Full refund within 30 days.

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