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[Nintex]

Yes, cats are killers when humans aren't around.

Previous studies had suggested that cats kill about 500 million birds a year. Marra's group came up with something very different. "We estimate that cats kill somewhere between 1.4 and 3.7 billion birds a year," Marra says. "For mammals, it's upward of about 15 billion."

Marra says based on those new figures, cat-caused mortality far exceeds deaths from other sources, like collisions with cars or wind turbines.

And that number is just for the US alone.