Canary in the coal mine – penguins

But for Dee Boersma, a biology professor at University of Washington, Turbo and the 200,000 other Magellanic penguins from the Punta Tombo colony on the Atlantic coast of Argentina are far more than new friends.

They have become the canaries in the global warming “coal mine,” signalling the effects of climate change on oceans through their rapidly declining population.
Seattle pi 30 Jun 2008