There are 6 Towhees in the US and, inarguably, the most colorful and distinctive is the Green-tailed Towhee. It is also our smallest towhee.
Green-tailed Towhee is a large grey sparrow with a rufous crown, a white throat and olive wings and tail. Its population is estimated to be about 4 million. Classified as "Least Concern", the Green-tailed Towhee breeds in the Interior West and winters in Mexico and the Southwest US.
Moving from a colorful sparrow to a flycatcher -- the spectacular Vermilion Flycatcher is the only red tyrant flycatcher. Unmistakeable in its brilliant scarlet plumage, the male has a thick, brown eyeline and wings.
This flycatcher ranges from South America to the Southwest US. Its population is estimated to be at least 5 million. It catches insects in mid-air by hawking and will lose its color if kept in captivity.
Other birds observed at Catalina State Park and Sabino Canyon included: Brewer's Sparrow, Vesper Sparrow, Lucy's Warbler, Pyrrhuloxia, Bewick's Wren and Hammond's Flycatcher.
Brewer's Sparrow is a Western sparrow whose breeding range extends from California to Alaska while its wintering range covers Mexico and the Southwest US. This is one of 2 birds named after Thomas Mayo Brewer -- who co-authored A History of North American Birds in 1874 with Baird and Ridgway.
this report for Kentucky and Tennessee).
Hammond's Flycatcher, named after William Alexander Hammond is a common flycatcher of the West. It is extremely similar to the Dusky Flycatcher and they can only be reliably disambiguated by their voice.
Catalina State Park: Google map link
Sabino Canyon: Google map link