A tragic course of events, caused by extreme weather, not really something you can risk assess for.
Should zoos be felling all trees in animal enclosures or go back to the days of concrete floors and thick bars ?
I'm not an expert but I would imagine it would have been difficult to dart the bears, there are trees in the boar enclosures
and the boars were still loose in there, which could have meant the bears still chasing them, keepers couldn't have gone
in to shut them away without risking their own lives.
I can't even begin to imagine what they all must have felt when the decision was made and my sympathy goes out the them