On Friday morning, zoo officials announced the arrival of 4-year-old Astra, who they hope will mate with Kulu, a 5-year-old ...

Along the frosty coast of Hudson Bay, hundreds of polar bears have been wandering for weeks, waiting for the wintertime sea ice to form so they can return to hunting ringed seals.

Climate change is transforming ecosystems in the far north. An international team of scientists has made some surprising discoveries.