Chapter 734

They took a long walk along the path of the butterfly museum, enjoying all kinds of beautiful butterflies.

Look at the popular science exhibition board on the roadside and learn a lot about butterflies.

For example, butterflies do not have a heat generation system. They need to adjust their body temperature by basking in the sun and using their wings to adjust their temperature.

When the sun is direct, the scales will open automatically to reduce the radiation angle of sunlight and absorb less heat energy of sunlight; When the outside temperature drops, the scales will close automatically and close to the body surface, so that the sunlight can be directed to the body, so as to absorb more heat.

In this way, you can always control your body temperature within a normal range.

The temperature control system on artificial satellite is designed to imitate the scales of butterflies.

When butterflies spend the winter, in order to make themselves not only observe the surrounding environment, but also bathe in the warm sunshine, they will face their head due south, like a compass.

The famous monarch butterflies and their migration are also introduced.

Monarch butterflies are called monarch butterflies. Like migratory birds in the insect world, they form a large group of more than 100 million in August and September every year, cross North America, winter in the pine forests of California and Mexico, and return to the north in the spring.

So many butterflies gather together, the scene is very spectacular. One butterfly is next to another in the tree. The dense and colorful butterflies dye the forest orange red.

Emperor butterflies migrate from generation to generation. They reproduce while migrating. After the older generation of butterflies die, their children will relay and move forward like frogs. A round-trip migration will be completed by five generations of butterflies.

The daily migration is about 130 kilometers, and the longest journey can reach 5000 kilometers.

Tang Xiaoxin looked at the exhibition board and imagined the scene of their migration. She couldn't help feeling a little excited!

These fragile elves, as thin as paper, have such a clear goal. They take the sun as a compass and fly straight in one direction.

Fly high above the curved surface of the earth, endure the pain of flying for several weeks, fly thousands of kilometers, end a short life, leave their own offspring, and let them continue to move forward with their genes.

What an incredible and romantic animal.

However, the subsequent content made her heart heavy.

In the past 20 years, the population of monarch butterflies has declined sharply, directly to the edge of vulnerability or even endangered.

One reason is the reduction of habitat, illegal logging of forests and the destruction of a large number of coniferous forests.

The other is the use of a large number of herbicides and pesticides, which reduce the amount of milkweed they rely on.

Moreover, with the global warming and the increase of carbon dioxide content, milkweed may produce intolerable toxicity to larvae.

With the increase of abnormal climate, a cold wave may cause many caterpillar casualties and fewer hatching butterflies.

Insects are an important component of biodiversity and also play a vital role in the operation of ecosystems. For example, pollinators around the world can create about hundreds of billions of dollars a year, but they rarely get public attention.

Recent studies have shown that in the past 30 years, the number of insects in the world has continued to decrease by 2.5% per year. Now, more than 40% of insect species are declining, and about 13 species are endangered, among which butterflies, moths and bees have the largest reduction.

Intensive agriculture on the scale of industrialization, excessive use of pesticides, urbanization and increasingly frequent abnormal climate change are the main factors causing the sharp decline of insect population.

Next to the exhibition board, there is a specimen of emperor butterfly, which is quietly sealed in glass.

Compared with other flying fresh butterflies, it looks a little bleak.

Tang Xiaoxin stared at the specimen and thought deeply.

Think about the butterflies in the garden. If they have become dry specimens, it is still very sad to daydream and miss their beauty when they live in this way.

If there is no attention and protection, if this continues, it may become a real scene in ten or twenty years.

"Don't cry, let the firefly take you away, and the country songs will always rely on..."

Fireflies used to be very common. There are many romantic and beautiful scenes in the fields at night. Now where can I see them?

With frogs, dragonflies, bats and other animals, they disappeared silently.

"Ah ~"

Tang Xiaoxin sighed gently and couldn't help thinking of the local exhibition area in the zoo.

It uses ecology to control pests without pesticides and chemical fertilizers. It also provides a habitat for all kinds of animals, and people live in harmony with nature.

Some hope rose again in my heart.

……

After visiting the butterfly hall, I came to the cherry blossom forest.

Beautiful cherry blossoms hang on the treetops, and everything you see is romantic pink.

A fresh spring breeze blew, the petals on the tree swayed slightly, bathed in the golden sun, and the translucent petals seemed to emit light fluorescence, pink and beautiful.

While walking, tourists enjoy the beautiful scenery of cherry blossoms, hold up their mobile phones to take photos from time to time, and record the romantic scene.

Tang Xiaoxin gathered in front of the cherry blossoms, took a deep breath and smiled: "smell it! Is this the taste of happiness?"

Qian Keke raised his hands, closed his eyes, hugged the cherry blossom forest and showed an intoxicated expression: "Wow, it's great. I really want to lie here and sleep!"

"Don't sleep, but continue to stroll!"

"I'm just talking about it ~"

After a trip to the snow monkey hall, the snow on the temple square has melted and the pond is covered with green water. It seems that it has been changed from hot spring to ordinary water.

Although we can't see snow monkeys bathing in hot springs, it's also a pleasant thing to see snow monkeys playing in the background of cherry blossoms.

A snow monkey is swimming in the pool. The water is rippling, and the beautiful cherry petals rise and fall.

Others jumped up and down the cherry tree, swinging the branches of the cherry tree, chasing and playing.

Occasionally pick a petal and put it in your mouth to taste it.

Two little monkeys rolled into a ball.

Monkey King Dahei squatted on a stone and glanced at the little guys playing.

It looks lonely and difficult to provoke, but the eyes are very gentle.

After playing for a while, a little monkey ran to Da Hei and dragged him, as if ready to pull him to play.

Big black was dragged helplessly and helped the little monkey comb his fur.

The groomed snow monkey narrowed his eyes and looked very comfortable.

But after combing twice, big black's action stopped. Just now I combed my hair. I just didn't want the little guy to make his perfunctory move.

The little snow monkey looked up, as if expecting big black to continue combing his hair.

Big black jumped off the stone, changed his position and continued to stay.