How many kinds of animals are there, and what are the types of animals?

Animals are a class of organisms in nature, mainly including protozoa, sponges, coelenterates, flattened animals, nematozoa, annelids, molluscs, arthropods, echinoderms, and chordates, etc., about 1.3 million species.

Horn: It is a product of the epidermis and dermis of the mammalian head. The epidermis produces horns, such as the sheaths of cattle and sheep and the epidermal horns of rhinos, and the dermis forms bony horns, such as deer antlers. The horns of mammals can be divided into five types: cave horns, solid horns, pronghorned antelope horns, giraffe horns, and epidermal horns.

The horn of the cave is composed of the heart of the bone and the sheath, which is commonly called the horn, which is born in pairs on the frontal bone and does not change it throughout life, and has a growing trend. The horns of the cave are endemic to bovids. There are many species of bovines, and there are many controversies about the classification of the following families, and it is generally believed that there are 49 genera and 59 species.

Solid angle, bifurcated bony horn without horn sheath. The newborn horn has tender skin on the core of the bone, which is commonly known as the antler horn, such as deer antler velvet. After the horns grow, the fur gradually ages and falls off, and finally only the bifurcated bony horns, such as deer antlers, remain.

Antlers periodically shed and regrow every year, which is characteristic of cervids. Except for a few sexes with horns such as reindeer, or without horns such as musk deer and roe deer, generally only males have horns. There are 17 genera and 38 species in the world (musk deer, roe deer without horns).

The pronghorn antelope is a horn type that is between the horns of a cave and the antlers. The heart of the bone is not bifurcated and the horn sheath has a small fork, and the bifurcated horn sheath has fused hairs, and the hairy horn sheath is replaced after the reproductive period of each year, and the bone heart does not fall off. This horn type is unique to males, while females have a short horn center and no horn sheath.

Now only one species of pronghorn antilocapra americana remains.

Giraffe antlers are made of ** and bones, and the ** on the bone core is almost no different from the ** on the rest of the body. There are 2 species (giraffe okapi).

The epidermal horn is composed entirely of hairy keratin fibers in the stratum corneum of the epidermis, and has no bone components, which is unique to the Rhinoaceae family. In the middle of the nasal bone, the two horns of the bihorned species are arranged anteriorly and backward, with the anterior horn growing in the nose and the posterior horn growing in the jaw. Only 5 species exist (Dicoros bicornis, Ceratotheriu simum, Rhinoceros unicornis, Dicerorhinus sumatrensis, Java).

At present, there are about 1.8 million species known to humans, and I don't think anyone knows how many species there are, so you can only ask how many animals humans know.

Common animal names are:Tigers, wolves, rats, deer, martens, monkeys, tapirs, sloths, zebras, dogs, foxes, bears, elephants, leopards, musk oxen, lions, red pandas.

Warthogs, antelopes, reindeer, koalas, rhinos, lynxes, pangolins.

Giraffes, pandas, anteaters, orangutans, manatees, otters, civets, dolphins, walruses, platypus, hedgehogs.

Arctic foxes, koalas, polar bears, kangaroos, armadillos, hippos, seals, whales, ferrets, etc.

The best of animalsThe largest living vertebrate in the world is the blue whale. It is 33 meters long and weighs 181 tons.

The smallest vertebrate animal in the world is the amawu frog. It is only millimeters long.

The largest invertebrate in the world.

It's king squid. It is 15 meters long and weighs up to 400 kilograms.

The smallest invertebrates in the world are single-celled organisms.

Paramecium. It is only 280 microns in length.

The largest dinosaur in the world was the fragile dinosaur. It is 62 meters long and weighs 180 tons.

The smallest dinosaur in the world is the Saurus vulgaris. It is meters long and weighs only kilograms.

The smallest insect in the world is the order Hymenoptera.

A species of egg wasp in the family Tasselidae. It is only millimeters long. The body weight is only milligrams.

The largest insect in the world is the giant dragonfly, which lived about 300 million to 100 million years ago. Its wings can reach up to one meter.

The animal kingdom consists of two major groups: invertebrates and vertebrates. Invertebrates include protozoa, worms, mollusks, and arthropods, among others, whereas vertebrates include fish, amphibians, reptiles, birds, and mammals, among others. Among the invertebrates, the phylum Protozoa, the phylum Rhomboids, the phylum Orthophytes, the phylum Pores, the phylum Platozoa, the phylum Cupida, the phylum cnidarians, the phylum Ctenophorae, the worms, the phylum molluscs, the phylum Arthropoda, etc.

Fish in vertebrates are divided into hagfish, lampreys, cartilaginous fishes, flesh-finned fishes and radial-finned fishes, etc., amphibians are divided into apopoda, tailed and aceridae, reptiles include scales, turtles and crocodiles, etc., birds are divided into plan-chested orders, penguins, protruding chests, etc., mammals include protozoan subclasses and eumatric subclasses.

There are many different types of animals, and the above is just a brief introduction to some common animals.

There are many types of animals.

At present, there are about 1.5 million species of animals known on the earth, which can be divided into two categories: invertebrates and invertebrates, and among the 1.5 million species, there are many animals that are unique to China, and there are more than 46,000 species of vertebrates, and the number of invertebrate species is 33 to 34 times that of vertebrates.

At present, there are about 1.5 million species of animals known on the earth, which can be divided into two categories: invertebrates and invertebrates, and among the 1.5 million species, there are many animals that are unique to China, including 73 species of mammals, 99 species of birds, and 44 species of fish.

Animals are generally divided into two categories, invertebrates and vertebrates, according to the presence or absence of vertebrates, among which the individuals with vertebrates are larger, with more than 46,000 species, while the individuals of invertebrates are smaller, but the animal species it contains are 33 to 34 times that of vertebrates, with about 1.3 million species.

Animals have their own unique characteristics in defense, storage, attack, reproduction and development, such as defense and motivation are the behaviors of all animals to deal with foreign enemies and protect their own survival, and they all feed on inorganic and existing things, in addition to almost all animals can reproduce sexually, but some animals can reproduce asexually.

1. Amphibians

There are about 2,000 species of amphibians, such as giant salamanders, commonly known as giant salamanders"Baby fish", as well as frogs, etc. It belongs to the subphylum Vertebrates and has the dual characteristics of aquatic vertebrates and terrestrial vertebrates. They both retain some of the characteristics of their aquatic ancestors, such as reproduction and development still taking place in the water, the larvae live in the water, breathe with gills, do not have paired appendages, etc.

2. Reptiles

reptiles evolved from ancient amphibians at the end of the Carboniferous period, with two atria and one ventricle in the heart, incomplete diaphragm in the ventricles, and an unconstant body temperature. Not only are reptiles further adapted to life on land in terms of adult structure, but their reproduction is also free from the constraints of water.

3. Birds and animals

Birds in China are divided into six categories: migratory birds, wading birds, climbing birds, land birds, birds of prey, and songbirds. These six groups are collectively known as the six major ecological groups of birds. More than 10,000 species have been found worldwide; There are more than 1,400 species in China.

4. Fish and animals

Fish, the oldest vertebrate. Some offspring of crosses with different chromosome numbers are still fertile. They inhabit almost every aquatic environment on Earth, from freshwater lakes and rivers to saltwater seas and oceans.

5. Mammalian air attacks animals

Mammals are the animals with the highest morphological structure and the most complete physiology in the animal world. Compared to other animals, the most prominent feature of mammals is that they are viviparous and that their young are fed with milk secreted by the mother's transport body. Mammals have fur to keep their body temperature constant and adapt to a variety of complex living environments.

Tigers, wolves, rats, deer, martens, monkeys, tapirs, zebras, dogs, elephants, leopards, musk cows, lions, red pandas, warthogs, antelopes, caribou, rhinoceros, lynxes, pangolins, giraffes, pandas, anteaters, orangutans, manatees, otters, civets, dolphins, walruses, platypus, hedgehogs, arctic foxes, koalas, polar bears, kangaroos, armadillos, hippos, seals, whales, ferrets, etc. <

Animals include tigers, wolves, rats, deer, martens, monkeys, tapirs, zebras, dogs, elephants, leopards, musk oxen, lions, red pandas, warthogs, antelopes, caribou, rhinoceros, lynxes, pangolins, giraffes, pandas, anteaters, orangutans, manatees, otters, civets, dolphins, walruses, platypus, hedgehogs, arctic foxes, koalas, polar bears, kangaroos, armadillos, hippos, seals, whales, ferrets, etc.

There are many species of animals in general.