英语听力：自然百科 Vampire Bats 恐怖的吸血蝙蝠

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The bats have heat sensors² in their noses. This thermal³ process lets us see what the bat sees. The bat wants to feed where the pig's skin glows white hot. Let the dining commence. Like two wildcatters fighting over a fresh oil strike, these bats battle over a particularly rich feeding spot. Four vampire bats, one sleeping pig. Why doesn't the pig wake up? Because the bat's teeth are razor-sharp and cut painlessly. The bats can sip⁴ to their hearts' content with the pig none the wiser. The bat's saliva⁵ actually prevents the blood from clotting⁶. As the bat sips⁷, the blood runs up a glue on the underside of its tongue. Mother Nature thinks out everything. These vampire bats can feast for a full half hour, drinking half their weight in blood.

 

In a month of feedings, five vampire bats can guzzle⁸ almost a gallon of pig's blood. In this case, it's the bats making a pig of themselves, not the pig.

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