Lack of oxygen killed stingrays, Calgary Zoo admits – CBC.ca


Calgary CTV

Lack of oxygen killed stingrays, Calgary Zoo admits
CBC.ca – 6 hours ago
The president of the Calgary Zoo says he's "99.9 per cent sure" human error caused the deaths of 41 cownose stingrays last spring.
Cownose rays died because of oxygen level Calgary CTV
Watchdog calls Calgary Zoo irresponsible 660 News
CHQR – Canada.com – Canoe.ca – Calgary CTV
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