CALGARY - The Calgary Zoo is scrambling to find out why 34 of its prized stingrays suddenly died.
The zoo says the cownose stingrays mysteriously died in the last 24 hours after behaving normally around noon on Sunday. Nine of the animals are still alive at the exhibit, which has been open for less than three months.
Food and water samples have been sent to independent labs and preliminary results on water chemistry are expected later today.
Shocked zoo officials say there is no obvious explanation for the sudden deaths and daily water tests have all been normal.
It is the latest blow for the zoo - three gorillas died in 2007 and an attempt to import a six-year-old hippo from the Denver Zoo late last October failed when the animal died less than a day after its 28-hour transfer.
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Article online since May 12nd 2008, 0:00
Steven Guilbeault - 
