(Photo by Jonathan Cooper via Pexels)
Giant species such as saber-tooth tigers triggered "ripple effects" still felt today when they vanished thousands of years ago, say scientists.
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(Michigan State University / PNAS via SWNS)
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A dire wolf reconstruction on exhibit at the La Brea Tar Pits & Museum. (La Brea Tar Pits and Museum & Natural History Museum of Los Angeles County via SWNS)
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