With about 66% of the estimated 90 million cats in the U.S. roaming outdoors, the country's bird populations are facing a major threat, experts say. "In the recent oil spill, fewer than 10,000 birds were killed in the Gulf [of Mexico] that we know of ... But literally millions of migratory birds are killed every year by feral and free-roaming pet cats. It's a serious environmental problem," said a representative of the Wildlife Society.

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