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A whale watching tour in Nova Scotia, Canada, saw a great white shark eating a whale carcass during a Sept. 2 excursion

It's a rare sighting because sharks "don't have to come to the surface to breathe," a tour guide said

The boat tour guide also said she had "never seen a great white shark before in the wild" in her 30 years on the job

A Canadian whale-watching tour set out to see some massive sea mammals — and got an unexpected extra.

The group set out with Freeport Whale & Seabird Tours in Nova Scotia on Tuesday, Sept. 2, according to Canadian outlet Global News , which was first to report the news. During the tour, the group came across not just a whale carcass, but also a great white shark who'd made a rare excursion to the surface to feed on it.

The expedition

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