Read the following passage carefully and compose a "sentence outline" for it.
Smart Ravens
A flock of ravens ravaging a dead body may technically be called an unkindness. People hate them, but ravens are not terrifying. Do they have sharp, curved beaks(鸟喙)that they use to tear dead animals to pieces? Yes. Are their calls close to a horrifying and mysterious laugh? Most definitely. But that doesn't make them evil. Rather, they are masterminds, good at making awesome plans for the future.
The latest findings of ravens come from two Swedish scientists who literally put ravens to test. Up until now, we know that ravens have some ability to plan ahead for their own food needs because they hide food to dig up later. Then again, squirrels store food in the ground for later and they're, well, not the smartest. They forget about 75 percent of their nuts, accidentally planting millions of trees in the process. And if "stupid" squirrels can be biologically programmed to store food for later maybe ravens aren't as smart as we thought. Except obviously they are.
Ravens, as it turns out, will often choose to give up a tasty nut now in favor of getting a better treat later. Faced with a piece of food and a tool that they know can open a box containing more delicious food, they will generally choose the tool- even if they don't have the box yet. They've learned that when researchers present them with the box in 15 minutes' time, they can use that tool to unlock their prize. That's great vision right there. Even small children often choose to eat one ice-cream immediately rather than wait a few minutes for more.
This shouldn't come as such a shock Ravens also steal from each other by watching competitors hide food, noting the location, and returning later to dig it up. And because they get stolen from, some ravens will actually pretend to hide food to mislead thieves.What's more, they can tell other ravens where to find a juicy, rotting animal body and team up to scare off their competitors. That ability-to communicate information about a distant location -is shared only by ants, bees and humans. Besides deceiving one another to keep a food source a secret, they can also take advantage of other animals. For example, they would call wolves over to a dead body that hasn't broken down enough yet so that the wolves can rip it apart, leaving more convenient scraps for the ravens to eat.
If all that doesn't make you love and embrace our raven lords, nothing will. These birds are geniuses in their own right--so what if their look is a little weird? Their intelligence isn’t to be feared; it's to be revered.Ⅰ INTRODUCTION: RAVENS ARE MASTERMINDS, GOOD AT MAKING AWESOME PLANS FOR THE FUTURE.
Ⅱ THESIS: RAVENS ARE SMART.
A. RAVENS HAVE SOME ABILITY TO PLAN AHEAD FOR THEIR OWN FOOD NEEDS.
B. RAVENS ARE WISE ENOUGH TO MAKE A BETTER CHOICE.
C. RAVENS CAN COMMUNICATE INFORMATION ABOUT A DISTANT LOCATION.
III CONCLUSION: RAVENS’ WISDOM SHOULD BE REVERED.
