At the risk of annoying the administrators, I'll put in a plug for an old-fashioned paper field guide -- they're easier to simply sit and leaf through, even when you're not trying to ID a bird. That makes them very useful learning tools.
This is a juvenile Cooper's. and it's probably not confident enough to tackle a squirrel. I've seen them fly towards a squirrel and the squirrel would duck under the limb and come up behind the Cooper's, chatting away and fussing at it. The squirrel actually seemed to be enjoying the encounter!! I don't know that even an adult Cooper's would take on a squirrel. They might if they were very hungry and there was nothing else around, but I've never seen an adult Cooper's go after one.
Rough-legged Hawks have "belly bands" as well but theirs are more solid rather than streaked. Also, light morph Roughies tend to have lighter-colored heads and smaller beaks than Red-taileds.
Not many. I live in the Western NC mountains - not big raptor country. Quite a few vultures but have to find some open areas to see most hawks, etc. Probably seen 15 all year. I do plan on visiting a few hawk watch sites this fall for the first time.
Ebony Jewelwing
Ebony Jewelwing by Greg Miller, on Flickr
Painted Lady
Painted Lady - Lake Paulinskill, Stillwater, NJ by Greg Miller, on Flickr
Unknown Fly Species
Unknown Fly Species by Greg Miller, on Flickr
Spicebush Swallowtail
Spicebush Swallowtail by Greg Miller, on Flickr