Those terrifying moments happened in Colorado as her two sons were playing at some riverside condominiums.
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Neighbors say they heard the mother scream after the mountain lion attacked the boy.
The mother jumped on top of the lion and fought off the wild animal. Her son was rushed to the hospital by his father, and is expected to survive.
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The boy had injuries to his face, head and neck.
Wildlife officials captured and killed two mountain lions yards away from the attack scene.
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Matt Robbins with Colorado Parks and Wildlife says the two animals were seen just prior to the attack.
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