The 54-year-old woman says she was running on a popular trail, when the animal jumped on her without any warning.
"It really hit me and knocked me down into the grass and was jumping on me. And I was screaming, my natural reaction was to scream," said Debbie Urquhart.
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The kangaroo backed off after the woman stopped screaming, and played dead.
Once the animal was gone, the woman ran nearly a quarter of a mile home for help.
She needed 45 stitches in her arms, neck, shoulder and back, but is expected to be OK.