Tintins watched a video and discovered the food webs, an image that represents the different relationships between the animals in an ecosystem. 
They discovered the concepts of producers, primary consumers and secondary consumers while analysing the different ecosystems. What happens when the food web is disturbed? What happens when an animals disappears?
Tintins had different opinions but all agreed that, when an species disappears their predators survive eating another animals.
Then then watched a video about a real event that happened in China in 1958, the four pest campaign. Following the orders of the president, Chinese people killed ALL the sparrows in China. Do you know what happened? Ask Tintins!
After watching the video Tintins read a summary of the story with a lot of mistakes in it!
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