A group of children, doctors and nurses at the Children's Hospital at Dartmouth-Hitchcock in Manchester, N.H., are out-roaring Katy Perry in a new music video.

The hospital released an inspiring cover of the pop singer's hit song "Roar," which features lip-synching, dancing and quite a few roars from the kids.

Since the video was uploaded to YouTube on Oct. 21, it has amassed more than 3 million views.

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