In 2006, a pack of six Mackenzie River wolves - a North American wolf - were put down because they were "not portraying their natural behaviour".

BBC: Pup and mother Elara

It was the first of three match-closing tries in six minutes for the Wolves.

BBC: Warrington Wolves 33-8 Bradford Bulls

Authorities, who did not have access to tranquilizer guns, killed two wolves, six black bears, two grizzly bears, nine male lions, eight female lions, three mountain lions and 18 Bengal tigers.

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