Canada probes deaths of hundreds of ducks

• Story Highlights
• About 500 migrating mallards land on partially frozen pond filled with toxic waste
  
• About five of birds that landed on Alberta oil sands survived, officials say
  
• Alberta premier says he's concerned oil-sands firm didn't report waterfowl disaster
  
• Probe will look at why firm didn't move faster with noisemakers to deter ducks
  
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