Tony Leukering

Was this recently? If so, no clue as to relatedness.

It's February -- it's a female. Head and neck noticeably gray and contrasting strongly to fairly strongly with color of chest -- American.

Nowhere near enough red on the head to even consider Red-breasted genes. Definitely a male, as the red of the throat hides much of the black throat frame.

Most people hate it when you get their names wrong. There is no 'l' in "Abert's Towhee."

Blackburnian has one sure-fire field character -- the pale braces on the back, at least one of which would have been visible in some of the photos.

Wingtips extend to tail tip = Peregrine Wingtips fall notably short of tail tip = Merlin

And note that the first part of the English name of Spizella pallida is a compound adjective, thus is hyphenated, with the letter immediately following the hyphen being in lower case. In case like "Great Black-backed Gull," both "Great" and "Black-backed" are modifying "Gull" independently, whereas, "Black" and "backed" are not.

Eucs (Eucalyptus)

Actually, "immature" is still a valid age for both buteos and accipiters, but only during the transition between juvenile and adult, thus with a mix of feather generations and pattern.

Note that the spelling is "juvenile." In the past, ornithologists often differentiated between the plumage ("juvenal") and the bird ("juvenile"), but that distinction has, unfortunately IMO, gone by the wayside.

In Cook County: Song Sparrow Fox Sparrow

This bird is SO on the drab end of plumage variation in the species, that it's probably an immature female.

In October, there are no drab Rusty Blackbirds.

Please provide date, as that is an important ID feature.

Adult Krider's look like this.