About the size of a pigeon, this northern alcid comes south to Maine for the winter.

I’ve seen black guillemots fishing close to rocky shores.  Some are still in their black-and-white breeding plumage (above). Most have changed to mottled white for winter.

In either case they have bright red legs that match the insides of their mouths.

I can see their red legs through the water.

(photos from Wikimedia Commons. Click on the image to see the original)