Just got back from Washington DC and Pennsylvania.

Great blue heron (just like our grey heron but a bit bigger)
Lots of mockingbirds
Red tailed hawk - sitting in a tree with some people with long-lens cameras watching it near the start of my run. Then it was still there (and so were the people) when I came back again, so I could ask them what it was
Some sort of groundhog/woodchuck type thing
And possibly bald eagle. I'm not sure about this but it was a large eagle-shaped bird with notable fingered wing tips, with a longer body than a golden eagle and a white head. It was near the Potomac river, where the internet tells me they are sometimes seen.