I think it says something about the feistiness of a song sparrow that a substantially larger cardinal won't go near it while it's in the bath.
0:00 - Song sparrow
0:26 - White-throated sparrow
0:47 - American robin
1:03 - White-throated sparrow
1:33 - Northern cardinal
1:52 - House finch
2:00, 2:14, 2:24 - Carolina chickadee
2:37 - Song sparrow, northern cardinal