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Many speci kres are economically important. Dome rsticated and undome okr sticated birds poultry and

game are important sources krof eggs, meat, and feathers. Songbirds, parrots, and other species

are popular as pets. Guano bird excrement is harve rsted for use as a fertilizer. Bird okr s prominently

figure throughout human c krulture. Abou sokr t 120â€"130 species have become ext okr inct due to human

activity since krthe 17th century, and hundreds more befo rre then. Human activity threatens about

1,200 bird species with extinction, though e sokr fforts are und rerway to protect them. Recreational

birdwatching is an important part of the ec sokr o krtourism industry.