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A golden eagle likes a room with a view and so its eyrie is usually located high up on a rocky cliff, ledge or tree. To keep the eggs safe from the weather, it is often built under an overhanging rock. It is not unusual for these nests to be located as high as 2000 feet above sea level.

Made of sticks, bracken and other plants, the center of the nest, called the cup, is lined with grass.

These nests continue to get bigger and bigger over time. Each spring, the eagle does home maintenance, fixing and adding to the eyrie, and so, it just keeps getting larger. These homes can reach ten feet in diameter and more than five feet high. Some nests are even thought to be almost one hundred years old!

Why does the author use bold print in this article?
a. to point out foreign terms
b. to indicate important but perhaps unfamiliar words
c. to show a topic change within the piece
d. to stress the main ideas of the article