For a long time b ats 61 (be) one of the most feared creatures in the animal kingdom. Many pop culture associations with them are 62 (relate) to vampire ( 吸血鬼 ). Though these associations are complete misunderstandings, bats do have a dark side as a 63 (er) disease vector ( 传播媒介 ). So there is good reason to be exceptionally cautious if you come into contact with bats. However, the fact is bats play a significant role in keeping a balanced ecosystem. Many organic farmers have learned about the benefits of 65 (have) bats nearby to help manage the amount of pests that show up without pesticides. One brown bat — about 66 size of a human thumb — can consume about 600 mosquitoes and other unwanted insects within an hour. They make for a fantastic, almost essential 67 (add) to pest management on any farm. Even large government organizations have realized the economic benefits of bats. The United States Geological Survey estimates that bat contributions 68 pest management save the country at 69 (little) 3.7 billion dollars per year. Without them, we would likely experience a dramatic drop in food production, which would ually make 70 (it) way into our weekly grocery bills.