What are the unexpected animal disasters?

Cat plague on Marivan Island.

Marivan is a small island in the Indian Ocean, in 1945, the first expedition from South Africa came here, a few mice that came with the ship also quietly slipped ashore, and in 1948, the mice became the overlord of the island, the expedition team transported in 5 cats to catch mice, but the taste of seabirds is better than mice, cats do not catch mice but eat birds, as a result, cats breed to 2,500, birds suffer, 600,000 are eaten a year.

Hawaii's snail plague.

In the thirties of the 20th century, some traders transported African giant snails to the Hawaiian Islands for human breeding and consumption. Some snails are old and inedible, so they are thrown into the wild, and within a few years, snails multiply in large numbers, everywhere, gnawing vegetables and fruits into a mess. People spray chemicals, and the land cannot be removed after 15 years of ploughing.

Goldfish Plague in Washington State.

Americans have long imported goldfish from Japan, and in 1973, some goldfish accidentally fell into the water of Washington state, and then multiplied in large numbers, and a few years later, goldfish took over 10 lakes; The trout in the lake could not compete with the goldfish for food, and the production was greatly reduced, and the fishicide could not kill the goldfish, and the fishermen complained bitterly.

Crab plague in Spain.

In 1976, Spain imported 50,000 crab fry from the United States and stocked them in the delta of a river. In a few years, hundreds of millions of animals are bred and the local population can only catch up to 4 million per year for human consumption. The water in the rice paddies drains down the dense crab holes; Crabs eat fish and shrimp, aquatic weeds, plankton, rice seedlings, and fish in the water, and birds have nothing to eat, and they don't stay here.

Australian Rabbit Plague (1859).

Rabbits are not native to Australia, and there were no rabbits there until 1859. But in that year, a farmer brought a herd of hares from England, a total of 24 of them. Little did he know that his move would cause an agricultural disaster.

In Australia, rabbits have few natural predators, so over the decades this has become a big problem. They eat crops, destroy newly sown seeds, gnaw tender bark and teeth, and burrow into the ground to damage fields and river banks. Nor does fencing prevent them from encroaching on farmers' fields.

In 1950, a new method of controlling hares was attempted, and a rabbit-killing disease, myxoma---sis, was introduced to Australia. Scientists first transmitted the disease to mosquitoes, and then to rabbits.

Once myxomatosis was introduced, it spread rapidly throughout the hare herd. In south-eastern Australia, almost 80 percent of the hare herd has been wiped out.

Hare reproduce very quickly, so it becomes a problem in a very short time. A female rabbit can give birth to 25 rabbits a year.

The disease was introduced to Europe in 1952 when a French farmer released two rabbits infected with mucus virus. Within a few months it had spread across Europe and even across the sea to the United Kingdom. By the end of 1953, only two rabbits per 1,000 rabbits were still alive in Europe.

The virus in the animal body has mutated to the new virus that can be transmitted to humans, such as rodent infestation, locust plague, and the introduction of alien species, which lead to the imbalance of the ecological balance of the region and affect humans! Unknown toxic species are invasive

Unexpected disasters.

In the Antarctic Circle, there is a small island of Marion, which is covered with snow all year round. In 1945, an expedition ship docked on the island, and no one expected that some rats on the expedition ship landed. There were no animals that restricted the breeding of rats, so they developed rapidly on the island, and three years later, the rats infested and it became "Rat Island".

The islanders immediately appealed to the mainland for help, and when the rescue boat arrived, it brought five domestic cats. No one expected that 30 years later, there would be 6,000 cats on the island, and it would become "Cat Island" again. These cats also no longer feed on rats, and they hunt birds on the island, eating more than 600,000 birds a year.

In order to protect the birds, the authorities had to send people to hunt cats with guns.

In addition to locust plagues, schistosomiasis, rat plagues and avian influenza.

Sixth grade, right? Me too. I'm here to check this information too!!

You're in the sixth grade, so you're learning this lesson! There are rabbit plagues, toad plagues, poisoning people and livestock. Spain, the Middle East, Zhejiang: Crab plague, destruction of crops, destruction of farmland!!

Locusts, schistosomiasis, rats, swallows (once listed as the four pests), cockroaches, monkeys, rabbits (occurring in Australia), wolves, elephants (ethnic minority areas)...

Australia, Japan: Toad plague, poisoning people and livestock. Spain, the Middle East, Zhejiang: Crab plague, destruction of crops, destruction of farmland!!

Locust plague, rat plague, crab plague, toad plague.

Thank you, I can excerpt it.

I'm also learning this lesson, and the teacher told us to look it up, troublesome

We're also learning this lesson, and I'm here to find information.

I can't even think of it, but let's think about it.

No animal can preempt natural disasters, and their senses are not the same as ours to perceive small changes. So they're more special.

Animals can be restless before an event happens, such as ants, horses, dogs, etc.

The scenery encountered along the way, can not stay, can not turn back, all the way wind and rain,