Read the article and answer the questions 1 - 10.
1 Deep in a den, some wolf pups huddle against their mother. They cannot stay warm without her body heat. The helpless pups cannot see or hear either, but the newest members of the pack do not need to worry. Their whole family will help take care of them.
2 The leaders of the pack are a male and female wolf. They are usually the strongest and oldest wolves too. When they walk, they hold their tails high like flags because this shows that they are in charge. In contrast, the other members of the wolf pack hold their tails low to show respect to the leaders. Being wolf pack leaders is an important job. They often decide when it is time to hunt. They also decide when the pups should leave the den.
3 When the time has arrived, the pack moves to a place close to new hunting grounds. This place also becomes a nursery area for the pups. It often contains big rocks or bushes to hide the pups, and it is located near a river or a lake so the wolves have fresh water to drink. Sometimes the wolf pack uses several different nursery areas during one summer.
4 The nursery grounds give the pups a safe place to grow and play. The pups wrestle one another and roll in the grass. Their games prove who will be a strong leader one day. They also chase small animals, such as mice and rabbits. The pups are beginning to learn important hunting skills.
5 The young pups are never left alone. When the pack goes off to hunt, one wolf stays behind to baby-sit. It watches over the pups and protects them. The other wolves help too. They bring back food for the pups and spend time playing with them.
6 As the pups grow, they begin to follow the pack when it leaves to hunt. At first, the young wolves tag along only for a short distance before they give up and return to the nursery. By the end of the summer, however, they are exploring areas two or three miles away.
7 The young wolves must grow fast. Winter will arrive soon. As the snow falls, it becomes more difficult to find food, and the pack may travel 30 miles each day in its search! Now the once-helpless pups are ready to join the hunt. With the care of their family, they have become working members of the pack.