Red-throated loon (Gavia stellata)
Added later: After looking through a couple of bird books, I believe Paul in Powell River may be correct that these are Common Loons. I guess I will have to get photos in the spring when their breeding plumage will identify them for sure. Thanks, Paul!
Sunday we were in luck when my husband and I visited Barrie (Ontario). Red-throated loons were in the harbour, passing through from the Arctic en route to a warmer climate (warmer than the Arctic, that is) to northern coastal waters on the Atlantic Ocean.
Wearing their winter drab
The red throats for which they are named? That's their blooming plumage.
The smallest and lightest species of all loons