If you visit their largest North American nesting ground in Toronto’s Tommy Thompson park, you’ll realize cormorants aren’t the prettiest birds — and they’re definitely not the cleanest.

The air smells like fish from their vomit, and in the past, their acidic feces has killed thousands of the park’s trees.

In the last few years, the birds have spread across the province, their colonies multiplying by the thousands on shorelines. Landowners have complained about the destruction of vegetation and fishermen blame the bird’s diet for hurting their livelihoods.

Now the province is considering controlling the double-crested cormorant by creating a hunting season for it. If approved, the…