A kangaroo jumped on two cyclists in South Australia last week.

An Australian woman says her breast implants "worked as airbags" when a kangaroo jumped her as she cycled with a friend.

Sharon Heinrich, 45, told news.com.au she was cycling in Clare Valley, South Australia last week when the kangaroo jumped from an embankment, knocking her and her friend Helen Salter from their bikes.

"I've gone to ride past, I thought: 'He's cute', and he's just jumped me and taken out the side of me," Heinrich told news.com.au.

"As I'm falling, I felt him push off me and then he's flown to Helen and taken her out."

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Heinrich said she suffered three broken ribs in the incident, and would have surgery this week to replace ruptured breast implants.

"They worked as airbags and have been ruptured by the ordeal," she told news.com.au.

Salter, who suffered concussion and whiplash, reportedly rode Heinrich's bike to a nearby business to call for help after the incident.

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