Visitors will not be allowed to touch the animals at the Toronto Zoo's Stingray Bay exhibit, but they can view them and take part in controlled feedings.
The Calgary Zoo has asked police to help investigate the deaths of its stingrays.
Cynthia Shipley of the Toronto Zoo says its exhibit is being scaled down because the spectre of poisoning has been raised in Calgary, and the zoo wants to take every precaution.
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