The main content of the animal world
In terms of content, Animal World featured a variety of interesting animals. From colorful aquatic creatures to birds flying in the sky, from all kinds of insects to the most advanced mammals in the biological world, Animal World is full of information and vivid and interesting language. In the process of writing, try to combine science with interest, hoping to add some happiness to your reading. Besides, we have set up in many places? Knowledge link? Help you understand some related background knowledge.
Animal world: On this blue planet where human beings live, there are many animals besides the most advanced primates. The existence of animals makes this originally quiet planet lively, and animals are the eternal partners of human beings.
Reflections on the animal world
During the winter vacation, I read the stupid popular science book Animal World, which introduced the physical characteristics and living habits of various animals, and opened a door for us to explore the animal world. This book is very detailed, even the smallest ants around us have a specific introduction: ants are insects living in well-organized groups. There are thousands of ants in each cluster with a clear division of labor. Ants have big heads, two pairs of jaws on their mouthparts, knee-shaped antennae, oval abdomen and generally yellow-brown, red or black body color.
This book makes me feel that nature is really strange, and there are many mysteries that need us to think and observe. One day, when I was playing downstairs, I suddenly saw a spider weaving a strong web and trying to catch some prey. I thought: can this net catch prey or not? With this question, I continue to look at spiders? Wait for him? Whether the capture method can be successful. After a while, an insect bumped into the spider cloth. Okay？ Bagua array? Although the worm has been struggling, it is of no help. Finally, the spider spits a liquid on the insect. What kind of liquid is this? With this curious mood, I opened Animal World. It turns out that this liquid can dissolve bacteria in prey and make the prey eaten by spiders harmless.
Brief introduction of platypus in animal world
Chinese name: platypus
English name: Platypus
Scientific name: duck-billed bird
Boundary: animals in the animal kingdom
Door: Chordata, Chordata.
Class: mammals
Objective: Monopore bacteria.
Family: bird beak family
Genus: platypus
Species: platypus
Adult platypus: 30-48 cm long; Tail length10-15 cm; Weighing 500-2000 grams.
The platypus is covered with soft brown thick short hair, the skull is smaller than the echidna, and the brain is hemispherical and smooth.
The skeleton of platypus
The limbs are short, the five toes are hooked, and there are membranous webs between the toes, which are shaped like duck feet. When walking or digging, the web is folded in the palm of your hand in the opposite direction.
It is covered with soft fur, like a good waterproof coat, and its tail is big and flat, which acts as a rudder when swimming in the water.
The mouth is extremely wide and flat, and it looks like a mask on your head. It looks like a duckbill, soft in texture, like leather and full of nerves. It can receive electric waves from other animals like a radar scanner. The platypus uses this sharp weapon to find food and find directions in the water.
There are wide horny gums in the mouth, but there are no teeth. Larvae have teeth, but adult gums have no teeth. Instead, it is a horny board that can grow continuously. The front occlusal surface of the plate forms many raised transverse ridges to crush the shells of mollusks such as shellfish and snails, or to chop up other foods. The back horny plate is flat, and the flat uvula opposite the plate is assisted? Chew? Function.
The researchers were surprised to find that platypus has no stomach, which means that the evolution of this species does not need a stomach. The stomach can break down certain foods and assist food digestion, but platypus only has intestine and esophagus, which are connected together. Scientists clearly pointed out that platypus had a stomach in the process of evolution, but for some reason it didn't form in the end. According to the best explanation theory, the food a platypus eats does not need a complicated digestive system, so it has no stomach.
Male platypus is a rare poisonous mammal with spikes in its hind limbs and can secrete toxins. It is said that when you are stabbed, you will feel severe pain and even be unable to move. This toxin greatly improves people's sensitivity to pain, lasting from a few days to several months.
Besides breastfeeding, platypus lives alone. They live in rivers, move in the water with sharp webbed feet, and dig holes on the banks of rivers and lakes to live. The platypus is Nocturnal Animals and a carnivore. It usually preys on crustaceans, earthworms and other animals at the water's edge in the early morning and dusk.
People usually think that platypus is a mammal with legs. In fact, it is very embarrassing for them to get out of the water. It has webbed feet, which is very suitable for swimming in the water and helpful for diving. But this unique body structure brings a lot of inconvenience to walking on land. Walking on land takes half as much energy as swimming in water. They basically walk on land by webbed joints. The webbed feet have nails and can be used to dig food or holes. Although they prey underwater, they spend most of the day in dry caves.
The platypus is a mammal. Although its mother also secretes milk to feed her young, it is not viviparous but oviparous. That is, the mother bird lays eggs and hatches by the temperature of the mother bird like a bird.
Because there are no obvious nipples, the newly hatched platypus has to find a nursing hole in the mother's abdomen to suck milk for a living. Lactating for about 4 months, living independently, 2 and a half years old.
Because platypus can lay eggs like reptiles or birds; After the eggs hatch, they can be fed water like mammals, which violates the existing division between mammals and non-mammals. After many controversies and studies, scientists finally concluded that this strange creature belongs to? Monopore animals? Family, right? Egg-laying mammals? . This animal represents a link in the evolution from reptiles to mammals.
Until the early 20th century, they were still hunted because of human demand for fur. Although the captive plan failed and platypus was easily affected by environmental pollution, they were not extinct under artificial protection.
People who read the main content of Animal World also read:
1. How does the animal world shoot the answers to reading questions?
2. What is the main content of A Brief History of Mankind: From Animals to God?
3. What are the main contents of The Golden Footprint?
4. The main content of Journey to the West
5. What animal is the best?