What's at the bird feeder in Washington DC?

There are some bird feeders and bird boxes outside the offices of the Humane Society of the United States on the outskirts of Washington DC. Here's a quick look at what comes to these feeders.

Northern Mockingbird

A wren shows off the accommodation he has to offer

White-throated sparrow

A red-winged blackbird

A familiar face - a European sparrow

A northern cardinal (male)

And again.