In some areas,lions and human beings are 　42　 control of land.Researchers believe something must be done quickly to 　43　 the animals. 

　　The African Lion and Environmental Research Trust(ALERT) has more than 100 　44　 in its breeding program.Antelope Park Farm is one of two sites ALERT operates in Zimbabwe. 

　　Gary Jones heads the Antelope Park Farm.He says ALERT has become involved 　45　 a sharp drop in the number of lions.His group believes this has been 　46　 mainly by humans.There are more people moving to this area every year.The lions have 　47　 land on which to live. 

　　Gary Jones says the decrease in the lion population affects the whole 　48　.He adds that other African nations are also seeing the 　49　 effects of this. 

　　There are countries,　50　 in central and north Africa,where the lion population has reached a(n) 　51　 level.Burundi,a country of east-central Africa,for instance,does not have lions in its national parks.It 　52　 wants to have lions reintroduced back into its national parks.The reason is that when you take the lion out of the equation(平衡),suddenly you get all 　53　 things start happening with the balance of 　54　.For example,you get too many prey(猎物) species,like giraffes and zebras. 

　　The United Nations’ Food and Agriculture Organization says 　55　 animals are threatened when farmers try to 　56　 their plants or animals. 

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