【单选题】

Some people associate migration mainly with birds.Birds do travel vast distances, but mammals also migrate. An example is the caribou, reindeer that graze on the grassy slopes of northernCanadA、When the weather turns cold, they travel south until spring. Their tracks are so well-worn that they are clearly visible from the air.Another migrating mammal is theAlaska fur seal. These seals breed only in the Pribilot Islands in theBering SeA、The young are born in June and by September are strong enough to go with their mothers on a journey of over 3,000 miles. Together they swim down the PacificCoast of NorthAmericA、The females and young travel as far as southernCaliforniA、The males do not journey so far. They swim only to the Gulf ofAlaskA、In the spring, males and females all return to the islands, and there the cycle begins again. Whales are among the greatest migrators of all. The humpback and blue whales migrate thousands of miles each year from the polar seas to the tropics. Whales eat huge quantities of plankton. These are most abundant in cold polar waters. In winter, the whales move to warm waters to breed and give birth to their young.

The phrase "An example" underlined in Paragraph 1 refers to an example of a ______.A．migratory mammal
B．place where animals migrate
C．migrating bird
D．person who associates migration with birds