填空题

There are 17 kinds of penguins in the world. All of them live in the southern (36) . Only a few (37) live on the continent of Antarctica at the bottom of the world. The emperor penguins are the largest. They are about 100 (38) tall and weigh about 30 kilograms. Their special (39) of mating makes them different from all other penguins.
For thousands of years the emperor penguins have lived on the (40) continent of Antarctica. These black and white birds live in large groups or colonies. There are about 40 emperor penguin colonies on Antarctica. In total there are about 400,000 birds.
These birds spend the summer swimming in the ocean in (41) of food such as fish and (42) . Penguins are not able to fly, but they are (43) swimmers. (44) But when summer ends, so does this easy time spent by the water. (45) .
(46) . They must find an area with some shelter from the freezing winds.