A、To catch the birds. B、To look for shade in the heat of the day. C、To catch other animals. D、To look for a kill made by another

(16) Lions prefer to eat without having to do much work. When resting in the shade, they are also watching the sky. (17) And if they see birds fly down, they immediately sense that something must be happening. Even in the heat of the day. They will certainly arise and run a mile across the plains to find out what is going on. (17) If another animal has made a kill, they will drive it off and take the dead animal for themselves. (18) A grown lion can easily consume 60 pounds of meat at a single feeding. Often, they eat until it seems painful for them to lie down. (19) The female lions are leaner and swifter, and as a result, are better hunters than the males. Most kills are made at night or just before dawn. The kill is the most exciting moment in the dayto-day existence of the lion, since these great beasts spend most of their time — about 20 hours a day — sleeping and resting. Lions are also social cats. And during these times of leisure, they love to romp against each other, and the young lions are always playing among themselves and with their parents.
Questions 16 to 19 are based on the passage you have just heard.
16. What do we learn about lions from what we have just heard?
17. Why do the lions watch the birds in the sky?
18. How much can a grown lion consume at a single feeding?
19. Why are the females generally better bunters than the males?