This is a young cedar waxwing that was in the E.R., where all birds go for a checkup when they are first admitted. Later, they'll move either to the recovery room, if they are adults, or the nursery if they are juveniles. In the winter there might be fifteen birds in the whole facility, whereas during nesting season there can be well over fifty, since we get many, many babies who were abandoned or fell out of their nests.
This is a maturing Mockingbird. We get all kinds of interesting birds: mourning doves, pigeons, robins and house sparrows are the most common, but we've also had common yellowthroats, black and white warblers, ruby-throated hummingbirds, and even an American Woodcock while I've been volunteering.