To many veteran birders last week's quiz bird is affectionately known as "butter butt". Others may refer to them as "Myrtles", a reference to their old name "Myrtle Warbler" and/or the fact that they are the Eastern race or Myrtle subspecies (Western "butter butts" are known as "Audubon's") of Yellow-rumped Warbler. The nickname refers to the squarish yellow patch of feathers at the base of the tail which are reminiscent of a pat of butter (from my old film archives I found this shot of a Yellow-rump from behind).
For this week we have an even littler Little Bitty Bird - have fun and good luck!
No idea what this bird is but it's gorgeous.
Ruby-crowned Kinglet... So seldom do I see the ruby but when they show, WOW does it stand out. Cool photo!