Craig Wesson, the manager at Kirkleatham Owl Centre, has been looking after Mario the mongoose since he found him abandoned by his mother at just a few weeks old.
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Laura Pidcock was among those to raise the issue at Prime Minister's Questions.
Mark Shaw was bound, beaten, bitten, gagged, attacked with weapons and stabbed to death in Grange Villa, County Durham, last December.
But Theresa May has refused Labour's call to halt the roll-out of Universal Credit, insisting the new benefits system was "working".