There are at least as many species of animals as there are on the planet, and how many species of an

To say exactly how many species of animals there are on the earth, I am afraid that even experts dare not guarantee it, because the understanding of animals is also accumulated with the continuous discovery of science and the continuous understanding of nature.

Aristotle, the great scholar of ancient Greece, described 450 species of animals in the 3rd century BC; The first taxonomist of flora and fauna, Rinnai, described about 4,000 species of animals in the first half of the 18th century; In the first half of the 19th century, there were 48,000 known species of animals; By the end of the 19th century, there were 500,000 recorded animal species; At present, there are more than 1 million species of animals in the data, and according to taxonomists, this number still does not reach the actual number of species.

In various scientific journals around the world, the discovery of hundreds of new species of insects is reported every year, which shows that our understanding of insects is far from enough. In 1931, a total of 80,000 species of butterfly moths were known, and by 1942, 10,000 new species had been discovered. Some zoologists speculate that there may be 2 million species of insects in nature that are not well known.

In vertebrates, fish are also understudied. In 1938, off the coast of South Africa, a strange large fish was caught by chance, and the fishermen sent the fish to a local museum, and without detailed study, the skin of the fish was made into a specimen, and later, when the experts studied its specimen and skull, they found that the fish was extraordinary, it not only belonged to a new family independently, but also belonged to a new species, and the fish in this order had long been considered extinct millions of years ago. This fish is extremely rare, and in the six years from its discovery to 1954, only eight fish were caught.

In addition, new species of mammals that we believe have been well studied are constantly being discovered, as evidenced by the discovery of the small rodent Cercythia rat. Therefore, how many animals there are in nature is a constantly changing number.

This is actually difficult to determine, because there are still many places on Earth that we humans are worth exploring, and there are many places that we have not been to.

However, according to zoologists, there are about 1.5 million known species of animals on Earth.

Hope it can be helpful to you, o(o thank you!)

The world is unpredictable, and everything is changing.

According to zoologists, there are about 1.5 million known species of animals on Earth.

Animals can be divided into two categories: vertebrates and invertebrates, vertebrates have a vertebral column composed of many vertebrae on the back of the body, and the individual is generally larger; Invertebrates have no vertebral columns, and most of them are small, but they are diverse, accounting for more than 90 of the entire animal population. For example, insects such as flies, mosquitoes, grasshoppers, butterflies, etc., are invertebrates.

Vertebrates can be divided into five major groups: fish, amphibians, reptiles, birds and mammals.

Fish are the largest group of vertebrates, with a total of 25,000 to 30,000 species including marine fish and freshwater fish, such as carp and yellow croaker.

There are more than 2,000 species of amphibians, such as frogs.

There are more than 3,000 species of reptiles, such as snakes, turtles, crocodiles, etc.

There are 9,000 species of birds, such as pigeons, sparrows. There are more than 4,500 species of mammals, such as horses, cows, lions, tigers, etc.

There are still many species of animals in the world that have not yet been discovered.

Scientists once estimated that there are 1.5 million biological species in the world. With the deepening of scientific research, this number has risen to 30 million 50 million. Tropical rainforests are home to more than half of the world's species.

At present, there are about 10 million defined and named organisms on Earth, yet many scholars estimate that there are still 10 million species in the world that have not been defined, named, or even discovered. The main reasons why these organisms have not been discovered are that their life cycles do not intersect with humans, that they only inhabit specific small areas, that they do not have much research value for humans, or that the organisms themselves are too small to be noticed. Wait a minute.

In addition, it has been at least three billion years since the existence of life on Earth. According to many evolutionists, taxonomists, and other relevant biologists, there are at least 10 times as many extinct species as extinct during this long period of time--- in other words, there are at least 100 million extinct species on Earth, including most archaea, protists, lower invertebrates, and lower vascular plants. To sum up, in general, there are about 10 million known creatures, about 10 million unknown creatures, and about 100 million creatures that have been buried in history--- so it is estimated that there are about 120 million species of organisms on the earth since the formation of the earth!

It is generally believed that less than half of the total number of species has been discovered.

After hundreds of years of investigation, scientists have discovered and named about 1.2 million animal species, among which protozoa.

There are about 40,000 species, 10,000 species of arachnids, the largest number of insect species, 950,000 known species, and 10,000 species of were.

Animals, in fact, there are far more animal species on the planet, because many animals are tiny and have to be seen with a microscope, some animals.

Live off the beaten track, such as in dense primeval forests, or deep in the ocean or in trenches. Therefore, there are still many animals in the world that have not been studied in detail, and scientists estimate that there are more than 10 million species of animals that have not yet been discovered and studied by humans, which shows how rich and diverse the animal world is.

About 1,250,000 (what the teacher said in class!) (*Hee-hee!!)

1.9 million species, because you're talking about animals.

About 1.5 million species have been discovered so far.

n various. What is known and what is not known, what is discovered and what is not discovered.