I live in Duluth MN and the past couple weeks we had a small hawk like bird calling almost the enterer day. He must have been successful because they are now nesting in a large spruce tree on our block.
I was watching it with my neighbor who happens to volunteers at the famous Hawk ridge raptor area. I asked him if it was a type of Kestrel which I grew up seeing a lot of them in Wisconsin, but it just did not look the same. I was told me it was a Merlin.
I will keep an eye on it into the summer