frog frog: tiá n j Ρ 1. Frogs are generally called frogs by southerners, just like corn is called corn by northeast people. In fact, things are one thing. As for the classification of frog species, it should be another problem. Personally, frogs and frogs are both general names for frogs. Buguo tiger frog is the real frog frog is the black-spotted frog. This is the difference and classification of the baby. Because it is difficult to observe the black-spotted frog and the tiger frog if they are not carefully distinguished, and they are also somewhat similar, the frog has become the name of the frog in the south, just like the northeast people call corn popcorn. In fact, there are many kinds of corn. Your last sentence is right. "It is because too many people think that frog is frog that frog is called the alias Rana tigerina rugulosa. Because it is often distributed in low-altitude rice fields, and its meat is tender than chicken, it is called frog. Also known as tiger frog, tiger frog, wrinkled frog or water chicken, it is an aquatic frog and a kind of red frog family. Tiger frog is a medium and large frog with a stout body. The male tiger frog is 6-8 cm long, and the female is 6-12 cm long, up to 15 cm. Its meat can be eaten by human beings, and the famous Guangdong dishes include frog and clay pot rice. At present, the tiger frog sold in the market is artificially bred. 2. Bird name. It is slightly like a chicken, smaller in size, with reddish chestnut feathers, olive back, green-brown mouth and red feet. Living in grasslands and paddy fields. Frog Frog belongs to the animal kingdom, Chordata, Amphibia, Anura, Primordinae, Middle Frog, Neofrog. English name frog. Anura is an amphibian. Adults are basically tailless. Eggs are usually produced in water, which hatch into tadpoles and breathe through gills. After metamorphosis, adults mainly breathe through lungs, but most skin also has some breathing functions. It mainly includes two kinds of animals: frogs and toads. There is no strict difference between these two kinds of animals, and some families include both. Generally speaking, toads live on land, so their skin is rough; Frogs are slim and good at swimming. The two bodies are similar, the neck is not obvious, and there are no ribs. The ulna and radius of the forelimb healed, and the tibia and fibula of the hind limb healed, so the claw could not rotate flexibly, but the limbs were muscular. Anura is the first step for organisms to land from water, which is more advanced than other amphibians. Although most of them can live without water, their reproduction is still inseparable from water, and eggs need to undergo metamorphosis in water to grow. Therefore, it is not as advanced as reptiles, which can live completely out of water. Frogs: There are about 4,8 species of frogs, most of which live in water, and some live in trees in the humid environment of the rainforest. Eggs are born in water, and some tree frogs can make their eggs pass through the tadpole stage only by accumulating residual puddles in tree holes or plant leaf roots. In 23, a new species of "purple frog" was discovered in western India. It lives in underground caves all the year round and only comes out to give birth when the monsoon brings rain. It is difficult to absolutely distinguish frogs from toads, and some families, such as Xenopidae, include both frogs and toads. The smallest frog is only 5 mm, which is only equivalent to the length of a person's thumb. The largest frog is 3 mm (more than a foot long). Its pupils are horizontal, its skin is smooth, its tongue is bifurcated, its tongue follows the front of its mouth, and it turns upside down to catch insects. There are three eyelids, one of which is transparent to protect the eyes in water, and the other two upper and lower eyelids are common. There are two sound sacs on both sides of the head, which can produce * * * and amplify the sound. Smaller varieties have higher frequency of calls. Some frog skin secretes venom to prevent natural enemies. A tree frog secretion living in the rain forest of the Amazon River basin is used by local Indians to make arrow poison and seal the throat with blood. Frogs are distributed all over the world except Caribbean islands and Pacific islands. But at present, it is rapidly decreasing all over the world, mainly due to environmental pollution, climate change, invasion of alien species, shrinking habitat caused by human expansion and other reasons. Frogs reproduce in a similar way to toads, and they also feed on insects, but large frogs can prey on small fish and even mice. They basically hunt at night. Frogs prey on a large number of field pests and are beneficial to human beings. It is not only the natural enemy of pests, but also the guardian of harvest. The familiar and pleasant croaking of frogs is actually like the beautiful music that nature can never play, and it is a quiet and harmonious field song. "There is a bumper harvest in the fragrance of rice, and listen to the sound of frogs." Farmers have the hope of sowing with the sound of frogs, and there is joy and joy in harvesting with the sound of frogs! Once upon a time, there were wide ponds in the suburbs and villages of the city, where frogs lived. However, almost overnight, it was swallowed up by the spread of the city. Some remaining frogs became real frogs at the bottom of the well. Although they were lucky enough to survive, they unfortunately lost their fields, lost their seedlings, lost the world and freedom of activities, and even dared to make a few calls in the dead of night, gently and slowly, as if they were afraid of disturbing the magnificent dreams of the city, and seemed to be calling away from their companions all the time. But more and more of their companions are also moaning more desperately in other corners of the city! A pair of greedy hands caught them from the field, and they were bought by a pair of numb hands. Before they could take a look at the strange city, they became meat on every family's table! Compared with that pair of greedy or numb big hands, their resistance is so weak and weak, and they only make a sad and desperate cry! Most species of amphibians have declined on the earth, and the blame for making living species become endangered species is attributed to many aspects, the most important of which is frequent human activities and the rapid development of global industry. On the one hand, it causes species extinction; On the other hand, due to industrial pollution, especially chemical industrial pollution, the deterioration of ecological environment is getting worse and worse, and wetlands are destroyed on a large scale. Recent studies have found that triphenyltin, as an agricultural fungal inhibitor, even if its content is lower than the field concentration, it may cause distortion and even death of several frogs. The bactericide triphenyltin is mainly used to deal with diseases in beets and potatoes, but sometimes it is also used in many crops such as onions and rice. This inevitably pollutes the aquatic ecological environment, some directly pollute paddy fields, and some also pollute rivers and ditches through surface runoff. Because the degradation rate of triphenyltin in liquid phase is very slow, it is enriched in water, which causes great toxicity to aquatic organisms, especially to the central nervous system of tadpole brain. Generally speaking, the higher the concentration of fungal inhibitors, the greater the toxicity to organisms. For amphibians, chemicals often lead to slow development, and slow development will make it difficult for them to escape predators. This is probably the cause of the extinction of frog populations in some areas. There are other pollutants responsible for the decline of amphibians in more areas, and acid rain is one of the chief culprits. In fact, almost all amphibian eggs and larvae can't survive in water with pH below 4.5. However, the pH of acid rain is generally 3.5, which can reduce the normal pH of pond and stream water to a lethal level. In Canada, Scandinavian countries and Eastern Europe, it has been confirmed that acid rain is the cause of the decrease of amphibians in ponds and lakes. Perhaps the reduction of ozone is the unshirkable responsibility for the decline of amphibian population in a larger region or even on a global scale. The thinning of the earth's ozone layer and the increase of ultraviolet radiation will make it impossible for amphibian eggs to hatch into larvae. Other amphibians that are most likely to be affected by enhanced ultraviolet radiation are those that live in the colder and closer polar regions. The ozone layer in those regions is the thinnest, so amphibians have to bask in the sun to regulate their body temperature. As a result, the amount of radiation is increased and DNA molecules are destroyed. Environmental hormones may also be responsible for the decline in the number of amphibians in the world. Pollutants decomposed by pesticides such as DDT may seriously damage the reproductive capacity of amphibians, similar to aquatic organisms such as fish and crocodiles. In fact, it has been found that this environmental hormone makes some female tree frogs masculine, and at the same time, it also makes other kinds of male tree frogs feminine. As a result, these tree frogs are infertile. This hormone molecule, which is not easily decomposed in the environment, is deposited in the sludge at the bottom of ponds and lakes and swallowed by the larvae of amphibians living at the bottom. This hormone can take effect in a small amount, and it is easily dispersed in the wind. Therefore, no matter where the native place is, it will pose a global threat. The increasingly serious greenhouse effect on the earth not only makes the climate change strangely, but also increases the number of frogs that change color gradually. In many places, there are various frogs in orange, white and even pink. This phenomenon is definitely not a joke between nature and human beings. Many malformed frogs found in North America are caused by the high content of vitamin A complex in the living environment, which contains retinoic acid, a hormone that can control the development of vertebrates in several important aspects, and its excess will also lead to human reproductive malformation. In the United States, some seriously deformed frogs have appeared in wetlands near lakes and rivers. Some have only three legs, some have lost their first two legs, and some have three or four hind legs. This news has aroused the shock and close attention of environmental experts and people all over the world. In this regard, some people think that it is a ghost of parasites, some think that the culprit is pesticides, and others think that the destruction of the ozone layer causes excessive ultraviolet rays to pollute the environment and cause animal deformities. The biggest one is probably caused by water pollution. At present, it can be confirmed that the water source is polluted by many substances, including special pesticides, heavy metals, chlorides, and of course, other chemical substances are not excluded. Because frogs are amphibians, they are generally regarded as an accurate barometer or indicator of environmental sanitation. Frogs are more vulnerable to teratogens when their embryos are directly immersed in water during development. For people, although their embryos are protected by many factors during their development, the frog malformation caused by hormones can also affect people, and the possibility of human aberration also exists. There is no doubt that frogs can be deformed and people can be distorted. It's only a matter of time before this day comes. Therefore, our conclusion is: protecting the ecological environment means protecting human beings themselves! Frogs refer to amphibians without tails, such as frogs (frogs with black spots) and toads (commonly known as toads). They belong to Chordata, Vertebrates and Amphibia in classification. Because the skin is bare, it can't effectively prevent the evaporation of water in the body, so they can't live without boiling water or humid environment, and they are afraid of drought and cold. So most of them live in tropical and temperate rainy areas, and there are very few species distributed in the cold zone. There are about 13 species of frogs in China, and almost all of them are experts in eliminating pests in forests and farmland. Common frogs in farmland are Rana nigromaculata, Rana zephyr, Rana aurea, Bufo raddei and so on. The bullfrog introduced from Cuba can be regarded as a "giant" among frogs, and its body length can reach 2 cm. Its Cleisthenes song is very similar to that of Niu Jiao, so it is called bullfrog. In fact, there are also frogs with large bodies in China, such as the tiger frog living in rice fields in the south of the Yangtze River, which is more than 12 cm long and barks like a dog. The spiny frog, also known as the "stone chicken", lives in the mountains and streams in the south of the Yangtze River, and its body length is about 12 cm. So how big is the smallest frog in China? Only slightly larger than broad beans. In early spring and February, when it was still snowy in the north, flowers were in full bloom on Hainan Island. At this time, you can hear the sound of "quack" near the rice fields during the day. This is one of the smallest frogs, the frog, courting. The body length is only 2.5 cm. When singing, a big bubble-singing sac will bulge at the lower part of the throat. Sometimes, you can also hear the sound of "squeaking" from the water plants, which is a kind of small frog-floating frog that is not easy to find. Floating frogs are gray, only 2 cm long, and often float among aquatic plants, only showing their heads. As soon as there is any movement, dive and escape. Although these frogs are small, they are natural enemies of small pests and termites. There are about a dozen tree frogs in China. They are light and thin, with suckers at their fingertips. They are good at climbing tall trunks or short bushes, and their body colors are consistent with their surroundings. The reproductive characteristics of frogs are hermaphroditism and fertilization in water, which belongs to oviposition. The breeding time is about the middle and late April of each year. In the process of reproduction, frogs have a very special phenomenon-embracing each other. It should be noted that the frog's embrace is not mating, but a link in the reproductive process. Studies have shown that if the male and female frogs are artificially separated (that is, there is no embrace process), then even during the frog's reproductive period, the female frog cannot excrete eggs. It can be seen that the biological significance of cuddling is that it can promote female frogs to ovulate. Generally, frogs lay eggs and fertilize in the water. After hatching, the eggs become tadpoles, live in the water, and then become young frogs to land. However, the tree frog lays eggs in a different way. The eggs produced by the tree frog with spotted legs are like a mass of white soap foam and a mass of cream, which adhere to the aquatic plants. The most interesting thing is the Emei tree frog, which lays its eggs on the leaves near the water. The eggs develop in the eggs, then fall into the lake and continue to develop. Another example is the piano frog, which sings sweetly. Before laying eggs, it will build a mud nest and then lay eggs in it. Some frogs belonging to tree frogs don't climb trees, but live in water. Some tree frogs, such as the red webbed tree frog and the black webbed tree frog, have wide webbed feet between their fingers and toes, which can spread their webbed glides from high branches to low ones, so they are also called flying frogs. Besides tree frogs, frogs with suckers also include rain frogs and rushing frogs. Among them, the rapids are special. They like to live in fast-flowing waters and can quickly cross the rapids and climb rocks. The tadpole of the turbulent frog is also very strange. It has a sucker in its abdomen, which can be adsorbed on rocks to avoid being washed away by the rapids. Toad with beard is a rare frog unique to China, which first appeared in Emei Mountain and was later discovered in several southern provinces. This frog's snout is wide, round and flat, and there are 12-16 pyramidal horny black thorns on the male maxillary margin, so it is called bearded toad. The function of these "beards" is still under study. There are many kinds of frogs, but no matter which one, they mainly feed on pests. The skill of frog 1. An expert in catching insects There is a pond in front of my house, surrounded by crops and weeds. Every summer, frogs settle down by the pond and become my neighbors. I often go to the pond to see frogs, and I gradually get familiar with their characteristics and living habits. Frogs love to eat small insects. Its action of catching insects and eating them is really interesting. One day after dinner, I squatted by the pond to watch frogs catch mosquitoes. A frog was lying in a small pit, kneeling on the ground with his hind legs curled up, his front legs supported, his face upturned with his mouth open, and his stomach bulging, waiting for something. Suddenly, a mosquito flew over and shook in front of the frog, only to see the frog suddenly jump up, his tongue turned over and fell to the ground again. The mosquito disappeared, and it sat still and waited. According to the farmer's uncle, a frog can kill 1 thousand pests a year. It is really our good friend! 2. The singer frog has a bulging thing on his mouth that can make a sound. When does it love to sing loudly? In hot summer, frogs usually hide in the grass and occasionally shout for a short time. If there is a bark, the people next to it will bark a few times, as if they were singing to each other. Frogs are happiest when it is after the heavy rain. At this time, there will be dozens or even hundreds of frogs croaking endlessly, and the sound can be heard for miles away.