New York is a very large city with 8 million people. How do so many people move on their way to work or school? In New York you can travel by subway（地铁）, bus, taxi and private （私人的）car.

The subway runs on the railroad lines under the city. Travelling by subway is the fastest way to get around the city. The second way to travel around the city is by public（公共的） bus. It is a slower way to travel. This is because the traffic is very heavy.

You can also travel around the city by taxi. This is very expensive, but the taxi will take you to the every place you want to. If traffic is heavy, the taxi will be slow, too.

During the mornings and afternoons, there is the “rush hour”.This is the time when the traffic is very heavy with people going to and from work. The last way to get around New York is using your own private car. It is inconvenient （不方便的） because you will perhaps be driving during the “rush hour”.The best time to travel around the city is from 9 a.m. to 4 p.m., because it isn’t the “rush hour”.

Why did the chicken cross the road? To get to the other side. Most people know this joke. But recently, some people have been much more worried about how the grizzly bear and mountain lion can cross the road. “Millions of animals die each year on U.S. roads,” the Federal Highway Administration reports. In fact, only about 80 ocelots (豹猫), an endangered wild cat, exist in the U.S. today. The main reason? Roadkill.

“Eco-passages” may help animals cross the road without being hit by cars. They are paths both over and under roads. “These eco-passages can be extremely useful, so that wildlife can avoid road accidents,” said Jodi Hilty of the Wildlife Protection Society.

But do animals actually use the eco-passages? The answer is yes. Paul Beier of Northern Arizona University found foot marks left by mountain lions on an eco-passage that went under a highway.   This showed that the lions used the passage.

Builders of eco-passages try to make them look like a natural part of an area by planting trees on and around them. Animals seem to be catching on. Animals like salamanders (蝾螈) and grizzly bears are using the bridges and underpasses.

The next time you visit a park or drive through an area with a lot of wildlife, look around. You might see an animal overpass!