COURAGEOUS CLIMBERS scale frozen waterfalls in Canada, as the ice threatens to collapse beneath them. Climbing heights ranging from forty to a few hundred feet, they brave the ice towers as they make their way to the top. These amazing photographs were captured by Canadian outdoor adventure photographer Alain Denis, 41, after he decided to explore the frozen waterfalls in the Laurentian mountain area in Quebec, Canada.
At least three people have been killed and more than 100 injured, some seriously, in two explosions at the finish line of the Boston Marathon .
HOPPING onto the scales, these adorable baby Humboldt penguins are ready for their first weigh-in .
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NATURE PAPARAZZIS prove you don't have to be Justin Bieber or Cheryl Cole to attract a pack of photographers .