In fact, Xiao Zhang simply popularized science to tourists. After all, this is the wolf Pavilion, which mainly introduces wolves. The reason for the decline in the number of elk in Yellowstone Park is more complicated than this.


    One reason is that the pregnancy rate of female deer decreased. At first, people thought it was caused by the fear of wolves. Later, it was found that it had little to do with wolves. It was mainly due to the serious drought caused by climate change, the reduction of the number of barren grass, the staple food of elk, and the malnutrition of female deer, so the pregnancy rate decreased a lot.


    Another reason for the decline in the number of elk is the increase in the premature death rate of deer. 70% of the deer died in the first year after birth. Biologists tracked the deer and found that only a small part was killed by gray wolves, and most of them were killed by bears.


    In the past, grizzly bears in Yellowstone Park rarely killed elk. Their favorite food was the cut throat trout in the river. However, in the 1980s, due to fishing enthusiasts stocking lake trout in the lake, there was a common tragedy of invading species and destroying local species. The lake trout killed the cut throat trout.


    Lake trout is different from cut throat trout. It lives in deep water. Grizzly bears can''t catch it, so they can only turn to deer.


    Whether it is the extremely frequent extreme climate or the invasion of alien species in recent years, they are actually inseparable from human activities.


    Therefore, the ecosystem is very complex and easy to destroy, but once damaged, it is difficult to recover, or even can no longer recover to its previous appearance.


    After listening to Xiao Zhang''s story, a father looked thoughtfully: "in the past, he was really biased against Wolves. Originally, he wanted to tell his daughter the story of Little Red Riding Hood and the big gray wolf. I felt it better to tell her the story of Yellowstone Park and wolves and the role of wolves in the ecological environment!"


    The boss sighed: "ah, so not only dogs are good friends of mankind, but wolves are also good friends of mankind!"


    Xiao Zhang smiled and praised, "Sir, you''re right. In fact, animals are our human friends."


    A tourist muttered, "are flies, mice and mosquitoes also friends? I''m sure I''ll take a taxi anyway. "


    Suddenly someone burst into laughter.


    Although this remark was suspected of being rude, Xiao Zhang thought about it and explained seriously: "these animals are really annoying to humans. I see a mosquito kill one every day.


    However, animals such as mice and cockroaches will breed more bacteria and diseases if they do not deal with rotten food and bodies. Moreover, mice are also the food of other animals such as owls, wolves and foxes, so they are also essential in the ecosystem. "


    The tourists saw a rare scene of wolves eating meat, deepened their understanding of wolves and learned so much knowledge. They thanked Xiao Zhang for his explanation and left with satisfaction.


    Zhuang Xiaobai came in upside down. There are still a lot of contents he hasn''t read.


    All the way around, I was addicted to sucking wolves and couldn''t extricate myself. After a turn, I came out of the cave in front. After taking a look at the time, I was surprised to find that it was already 11 o''clock!


    I wandered around the wolf house for an hour.


    It was almost lunch time. He was ready to go to the tiger house again. After reading it, he went to have a meal.


    I''m looking forward to it. I don''t know what surprise the most respected tiger Museum in the strategy can bring him?


    Tiger house, Fang Ye is here now!


    Holding a watermelon, he waved to the two tigers on the edge of the pond with a smile and said, "Jiao Jiao, ice cream! I came to see you! "


    Some unknown tourists saw a man in the exhibition area and exclaimed, "shit, what''s the situation? How did someone run in?"


    A tourist who knew the situation took the initiative to explain: "it''s all right, this is director Fang! It''s called the big city Druid. It''s common for people to roll up a tiger or something. "


    "Brother, really?"


    In front of the glass curtain wall, the breeder''s small bag explained to the tourists: "well, don''t panic, this man inside is our garden head! Our head is respected and loved by all animals in the zoo, including tigers.


    Remind everyone, don''t imitate dangerous behaviors. Tigers don''t have such a good temper with strangers. Even our keepers who usually feed tigers dare not touch without protection without the company of the gardener. "


    Although Zhuang Xiaobai had heard about the existence of such a god man in Linhai zoo before, it was incredible when he really saw it: "people can get along so closely with tigers. It''s a little powerful."


    Then he noticed a watermelon in fangye''s arm. It was strange: "is this to feed watermelon to the tiger? Tigers are not vegetarian, are they? "


    Jiao Jiao was walking on the tiger''s step and leisurely walking on the edge of the pool. She was in a good mood, while the ice cream lay on the grass and slept. She shook her ears and didn''t respond.


    When she found Fang Ye coming, Jiao Jiao looked at the sleeping ice cream, lowered her head, bit its neck, held the ice cream in her mouth, and brought it to him. Her amber eyes looked at him meekly, as if to show her merit: "look, I''ll take the child well!"


    Ice cream was asleep. She was caught by her neck and hung in the air. She was dazed and half opened her eyes. She pedaled jio a little. Her eyes were full of doubts and unhappiness: "what''s the matter? What happened? "


    The tourists were happy: "Oh, the little tiger has a happy face!"


    "The little tiger said, mom, you have no face holding me like this!"


    "The children are willing to take it with them. This is a very trusted thing to do. We can see that the relationship between the gardener and the tiger is really good!"


    Jiaojiao put the ice cream on the ground. The ice cream was caught for a short time. She shook her body and stood firm.


    Seeing his favorite Fang ye, he immediately forgot his unhappiness. "Wow" shouted happily, greeted his father, rushed over and naughtily hugged his shoes and bit them.


    Fang Ye patted Jiao Jiao''s big head and rubbed it in a soft tone: "Hey, good girl, it''s hard for you to take care of your children. But you don''t have to bring the ice cream. I''ll just walk over by myself. "


    I can''t help but want to hold Jiao Jiao''s neck with two hands and roll it well, but with a watermelon in my hand, I can only touch it with one hand.


    Today I brought watermelon for the tiger!


    In fact, tigers not only eat meat, but also vegetarian. They eat some fruits and berries.


    Although cats have a weak ability to absorb plants, they can get vitamins and minerals from plants that are not in meat food. Being vegetarian is not to satisfy their hunger.


    Another is that when tigers in the wild eat, they basically swallow the belt meat. In addition, they often clean their fur with their tongue. These hairs accumulate in the tiger''s body and are not conducive to digestion. At this time, the tiger will eat some grass and use the indigestible grass to help adhere the indigestible hair and bones to form hair clusters.