The peregrine falcon, a predatory bird indigenous to NorthAmerica, was once in danger of extinction. In the 1960’s, scientists discovered by products of the pesticide DDT in the birds’ eggs, which caused them to be too soft to survive. The use of the pesticide had been banned in the United States, but the falcons were eating migratory birds from other places where DDT was still used. In order to increase the survival rate, scientists were raising the birds in laboratories and then releasing them into mountainous areas. This practice achieved only moderate success, however, because many of the birds raised in
captivity could not survive in the wild.
There is now, however, a new alternative to release in the wild. A falcon that has been given the name Scarlett chose to make her home on a ledge of the 33rd floor of a Baltimore, Maryland, office building rather than in the wild, and, to the surprise of the scientist, she has managed to live quite well in the city. Following this example, programs have been initiated that release birds like Scarlett into cities rather than into their natural wild habitat. These urban releases are becoming a common way to strengthen the species. Urban homes have several benefits for the birds that wild spot do not. First, there is an abundance of pigeon and small birds as food sources. The peregrine in the city is also protected from its main predator, the great horned owl. Urban release programs have been very successful in reestablishing the peregrine falcons along the East Coast. Though they are still an endangered species, their numbers increased from about 60 nesting pairs in 1975 to about 700 pairs in 1992. In another decade the species may flourish again, this time without human help.
The main purpose ofthe writer is to inform the readers about...
The population falcon in the United States
How peregrine survive in the wild habitat
The life of Peregrine and Scarlett
The effort of scientists to preserve falcon
How human help animals intheirwild life
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Dalam teks ini dari awal sampai akhir ditekankan tentang cara para ilmuwan menanggulangi populasi elang yang nyaris punah. Seperti yang terkadung dalam dua ide utama dalam dua paragraf teks:
Dapat disimpulkan kalau penulis bertujuan untuk memberitahukan perjuangan para ilmuwan dalam mereservasi spesies elang.
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