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Karen Espersen, owner of Universal Ostrich Farm, with some of the 400 ostriches that may be culled due to an outbreak of avian flu. Courtesy of Universal Ostrich Farm

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Explainer
The ongoing battle between a British Columbia ostrich farm and federal authorities continues as the Canadian Food Inspection Agency (CFIA) advances its plans to cull nearly 400 birds over avian flu concerns, while the farmers insist the animals have developed herd immunity and should be spared.