In my garden in Dundas, the slugs used to be oatmeal colour. Now they are orange, and a bit larger. What happened?
Well, this is interesting. When you say they used to be oatmeal, was that this spring, last fall or summer? I don’t know a lot about slugs but it could be something to do with their life cycle, they start out brown and turn orange. It could be that it is a different kind of slug enjoying your garden this year. Perhaps you could find a photo of the oatmeal one and then a photo of the larger orange one and see if they are related.
I googled slugs, ONtario are found great images on ‘slugwatchontario’.
Have fun with this.