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TOEFL Directory > TOEFL writing > Listening Unit one passage 17
Listening Unit one passage 17
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★Listen to a lecture in an ornithology class
You know, it' kind of fashionable among students of birds just study well and exhausted species, especially in danger ones like golden eagles or spotted owls. But I often think that everyday-birds, birds that are really part of our lives are simply overlooked, so I'd like to spend some time talking about very common bird "black crows.? It might surprise you to know that crows are among the most challenge birds to observing study. First all, they look alike. Picking out one or several individual crows or flocks in finding them again later is almost impossible, people study in larger animals can put some time to mark on them, so they can tell them apart, well, you can trap large animal like a bear in a mobilized or tranquilized gun, then it is easy to put a tag on it. But try doing that to a crow you probably kill it. Secondly, crows are highly intelligent survivors, they adapt easily to wildly varying situations. This adds to the difficulty of studying in them, because they pick up so many individual allies habits, so you can never be sure about any conclusion you reach about crows from observing them applies the whole species or just those particular crows you being watching. One general observation about crows can't be made the reasonable degree of certainty, it had been the last four years, more and more crows have been found living in large cities. They are tracked by people who produce a normal surmount of garbage and leave them places that crows can easily get to, it make for distances they must have trouble to hunt a large shorter.
Correct answers :CBADC
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