Well, the answer is no, but with photos like this one, one can hardly blame someone for asking such a question! LOL
This photo is by Pat Gaines of Westminster, CO. To see a larger version, click the photo or his name to get to Pat's page on Colorado Birders. At the bottom of his page, is a slide show of his photos...you can watch the show, see the photos all on a few pages or even full screen. This one he called "Bareback" and it shows a kingbird harrassing a Red-tailed Hawk. Wild, huh?
Yard-birds seen in August:
Bullock's Oriole, White-winged Dove, Evening Grosbeak, Western_Wood-Pewee, Calliope Hummingbird, White-breasted Nuthatch, Rufus Hummingbird, Mourning Dove, Lesser Goldfinch (black- & green-backed), Hairy Woodpecker, Black-headed Grosbeak, Black-capped Chickadee, Black-chinned Hummingbird, Broad-tailed Hummingbird, Common Grackle, Turkey Vulture, American Robin, Red-winged Blackbird, European Starling, Northern Flicker - Red-shafted, Downy Woodpecker, Black-billed Magpie, House Sparrow, American Goldfinch, Pine Siskin, House Finch - red, yellow and orange variants, Eurasian Collared-Dove