An eyrie is the nest of a bird of prey such as an eagle or hawk. Eyries are perched high, in tall trees or on cliffs.
You've probably seen a bird's nest or two, but you may not have seen an eyrie. That's because eyries are very high up. Some eyries are in enormous trees, while others are on the sides of cliffs and mountains. This keeps the bird's nest very safe from other animals, but the birds who make eyries are dangerous: hunting birds such as eagles, falcons, and hawks. After killing and eating its prey, an eagle will return to its eyrie.