Reading: Chủ đề Peregrine Falcon

The Peregrine Falcon is a large, powerful falcon of seashores, mountain ranges, and the arctic tundra. Peregrine Falcons hunt medium to large sized birds, and are especially fond of ducks, shorebirds, and pigeons. Peregrine Falcons are extremely strong flyers, and often seize their prey at speeds of over 100 miles per hour. Some Peregrine Falcons have even been clocked at higher speeds while hunting.

The Peregrine Falcon could once be found throughout the United States. DDT, a chemical for controlling insects, caused the eastern population of Peregrine Falcons to crash. Peregrine Falcons, Bald Eagles, and other birds of prey would eat fish and ducks that were contaminated with the chemical. As DDT built up in the their bodies, such birds of prey would lay brittle eggs that would crack easily. In 1972, DDT was made illegal to use in America, and some birds of prey made a comeback. The Peregrine Falcon, however, did not.

Scientists took a different approach to the Peregrine Falcon. Since Peregrine's nest on mountain cliffs, scientists began capturing the falcons and relocating them to big cities with skyscrapers. The plan worked. Today the Peregrine Falcon is no longer an endangered species. Peregrines now thrive in Boston, New York City, Baltimore, and Pittsburgh. In those cities, they can have as many pigeons as they want. 

Trả lời câu hỏi trắc nghiệm ở