Why wildebeest is the most abundant herbivore in the African savannah

I think it has something to do with the fact that they have a large number of them, and then they reproduce quickly, so that the African savannah is full of wildebeests. It is also possible that they are the most herbivores in the entire African savannah because of their large migrations, after all, wildebeest is the most picky about the quality of grass, and makes many migrations each year with the grass season, making it the most herbivore in Africa.

And this way, always step 1 to get the freshest and most nutritious grass, other herbivores can only eat the rest of the wildebeest. This will affect the growth of other herbivores, which in turn will affect their ability to breed and raise their next generation.

The migration of wildebeest is not in units of 1,000 or 10,000 heads, but in 100,000 heads, and the chance of being left alone is smaller than that of other animals. Because migration is too frequent, the survival of the fittest effect will be more obvious. In order to adapt to the great migration habits, all female wildebeest have a simultaneous reproductive period and give birth en masse.

It can also ensure the continuation of the ethnic group.

Another reason may be the environment in this part of Africa, where the wildebeest looks like cattle and lives in the eastern and southern parts of Africa. During the rainy season (March to May), there is plenty of rain and the land is dotted with African wildebeest in the vast grasslands. But during the dry season (July-September), the African wildebeest have to leave in search of fresh forage, and they gather up to 10,000 in large groups in search of food, covering 48 kilometres a day.

African wildebeest only eats young grass. The zebra eats the same grass as it, but waits until the grass is a little older. Another herbivore, the African oryx, also eats this grass, but it is eaten by the grass that has already grown.

In this way, these animals are able to coexist peacefully in the same place, without competing with each other for food. Moreover, mating takes place on the way to mass migration. Whenever the herd of wildebeest comes to a stop, the males will pull the females together, run around them with their heads held high, and fight with other competing males.

Such groups can only last a few days.

In the African savannah, where the largest animals on land share space with the smallest, this is one of the most expansive unexplored areas. Wild animals either congregate in groups or act alone. The rainy and dry seasons alternate as scheduled, and the weather largely determines the rhythm of the entire ecosystem.

Many large herbivores, most of which live in groups, vary in size, social structure, mate and parent-child relationships, but they are all souls of the African wilderness. One of them is the wildebeest, a large antelope that belongs to the bovidae family.

In appearance and behavior, wildebeest is very different from other antelopes. There are two types of wildebeest, white-tailed wildebeest and spotted wildebeest. They are 1.4 meters tall at the shoulders, 2.4 meters long and weigh up to 270 kilograms.

They live throughout Namibia, Angola, South Africa, Botswana, Zambia, Zimbabwe, Mozambique, Tanzania and Kenya. In vast grasslands, bushes, forests, mountains and steppes, wildebeest is the most common herbivore. They are active day and night and feed almost exclusively on grass.

However, when grass is insufficient, they also eat shrubs and trees.

Occasionally, tens of thousands of wildebeest gather in herds, but during the non-migratory period the herd usually numbers between twenty and thirty members and is loosely structured, with females and their cubs centred in between. Every year in May and June, the spotted wildebeest migrates to new pastures. The wildebeest herd was one and a half million in number, and thousands of zebras and gazelles followed the migratory army to new pastures.

They travel more than 1,600 kilometers and migrate for miles, which is one of nature's animal wonders. To sum up, this is my personal opinion, if you have different opinions, welcome to comment!

Because the animals that live here will face a lot of natural predators, they will basically adopt non-stop mating, so as to increase the success rate and allow the whole group to reproduce.

Because wildebeest is a very fertile animal, and their life span is particularly long. They also don't have many predators, so they are able to survive on the African savannah.

Because the wildebeest on the African savannah has a particularly strong reproductive ability, and its size is also very large, and there are few natural predators.

Because he has a relatively strong physique, and his survival ability is very strong, he is the larger family of herbivores.

It seems to be common for herbivores to have horns on their heads, cattle, sheep and deer, and rhinoceros to have horns on their heads. The horns have two functions: one is to attract the opposite sex, and those male deer with strong antlers are more attractive in the eyes of the female deer, because the individual who can grow a pair of magnificent antlers must be in good health, and have good genes, and it is not wrong to have children with it; Another function of the horn is as **, here ** is divided into two kinds, one is the same kind of fighting**, such as the wrestling between the male goat and the stag, and the other is as a defense against foreign enemies**, such as the African buffalo counterattack with horns.

<> fact, these horned herbivores that we are familiar with and talk about belong to mammals, while mammalian carnivores do not have horns, such as jackals, tigers and leopards. Why don't carnivores grow horns? Because horns affect the concealment and predation success rate of carnivores, even horns that can be used are not as good as sharp claws and teeth, so the horn structure does not appear in carnivorous mammals and has become a stable feature.

Do all carnivores not grow horns? Not really. Paleontologists once discovered a large carnivorous dinosaur that lived in the Cretaceous period in South America, and it was called Carnotaurus.

A pair of horns grew out of the head of the carnotaurus, just like a cow, so the meaning of its name is "cow that eats meat".

<> carnivorous carboreus was more than 8 meters long and about 3 meters tall when it became an adult, and its weight was tons. A pair of horns grew on the top of the carnotaurus head, one on the left and one on the right, and paleontologists speculate that the horns were used for fighting between the same kind.

Horns are used as a defensive ** and decoration in many animal groups, but their defensive status is not suitable for highly aggressive predators.

Equine herbivores rarely have horns, because they eat vegetarian food, and they don't need to use horns to fight, so they degenerate and disappear over time.

Because equine herbivores often need to lower their heads to graze, and if they have horns, it is easy to affect their grazing.

It belongs to the order Odd Hoof, does not have horns, and requires sufficient exercise, and when running quickly, the horns will hinder him to a certain extent.

Because the wildebeest is so fast that no animal can catch up with them in the African savannah, it is the most herbivore in the trees of the African savannah.

There are many wildebeests, the first because they are more reproductive, and the second is because, although they are herbivores, they also have a certain aggression and can be used to protect themselves, so that wildebeest can protect themselves in times of danger.

Because this animal is very tall, it is impossible for ordinary carnivores to eat them, and it takes several carnivores to cooperate to put them down, and their reproductive ability is particularly strong, so their number is also increasing.

Because wildebeest is a picky eater and has a relatively high requirement for grass, it often migrates in large numbers. In this way, all female wildebeest have a similar reproductive period and breed in large groups.

a. The reason for the development of the horns of the modern wildebeest is the result of the struggle for survival, not the result of the struggle from generation to generation

b. Variation refers to the difference between offspring and parents, and the phenomenon of difference between offspring individuals, mutation is not directional, and B is wrong

c, this question can not determine the reproductive ability of the horned developed species is stronger than the reproductive ability of other species, c false d, wildebeest to compete for the mate to carry out the struggle for survival, due to the survival struggle, the horn of the male wildebeest because often in the competition for mates as **, so that the horned developed male wildebeest can generally find a mate, its traits have been accumulated from generation to generation, and the formation of the current horned developed male wildebeest type And the hornless male wildebeest because of the lack of a mate, its traits can not be transmitted, and are eliminated, In this way, after generations of selective evolution, it has become today's wildebeest with developed horns, d right

Therefore, d

D test question analysis: Darwin in the struggle for survival, the survival of the fittest, the process of the unfit being eliminated is called natural selection, Darwin believes that natural selection is a long-term, slow, continuous process, because the struggle for survival is continuous, so natural selection is also continuous, through the selection of the living environment from generation to generation, species variation is directed to one direction accumulation, so the traits are gradually different from the original ancestors, so that new species are formed, The horns of the male wildebeest are often used as ** in the competition for mates, so that the horns of the developed male wildebeest can generally find a mate, and its traits have been accumulated from generation to generation, and the current horned developed male wildebeest type is formed, and the horns of the underdeveloped male wildebeest are eliminated because they cannot get a mate, and their traits are not transmitted, so they choose D.

The number of parts of grass growing per day: (40 7-80 3) (7-3) = 10 parts, the number of parts of grass in the grass: (40-10) 7 = 210 (parts).

Set x days to eat, according to the question.

210+10x=50+48+…+50-2x）210+10x=50x-x（x-1），210+10x=50x-x2xx2

41x+210=0

x-6）（x-35）=0

x=6 or x=35

When x=35, 50-2(x-1)=50-2(35-1)=50-68 0, so x=35 is not on topic, should be discarded, Answer: The wildebeest will leave the area on the 6th day in search of new food

Darwin called the process of survival of the fittest and the elimination of the unfit in the mountains of survival as natural selection Darwin believed that natural selection is a long-term, slow, and continuous process Because the struggle for survival is carried out indiscriminately, natural selection is also carried out continuously, and through the selection of the living environment from generation to generation, species variation is accumulated in one direction in a directional manner, so that the traits are gradually different from the original ancestors, so that new species are formed

The horns of the male wildebeest are often used as the first in the competition for mates, and the male wildebeest with such developed horns can generally find a mate, and its traits have been accumulated from generation to generation, and the male wildebeest type with developed horns is now formed, and the male wildebeest with underdeveloped horns is eliminated because they cannot get a mate, and their traits are not transmitted

Therefore, d