Five years ago, the City of Toronto sounded a warning about an explosive growth in its rat population. The city planned to ... study it. Now, both Toronto and Ottawa are desperate for a plan to tackle  highly visible rodent problems. But nothing's worked yet.

Meanwhile, Alberta has been "rat-free" for decades, and the woman in charge of keeping the province that way has some thoughts about more experimental methods that might be considered. So how does Alberta do it? Why can't Ontario cities emulate their methods? And why does it seem like rats are everywhere in (most) big cities right now?

GUEST: Sheila Reid, reporter, The Canadian Press

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