Orin, those owls might be mourning doves, the calls of which are often mistaken for owls. Here is a place to hear mourning dove calls/sounds:
http://www.allaboutbirds.org/guide/Mourning_Dove/sounds
And here's a page of owls and their typical voices:
http://www.allaboutbirds.org/guide/brow ... ?family=55
Or they might be owls!
In addition to the resident and feral cats about (warring factions, all, as the clumps of fur outside attest), I get raccoons more often then opossums, but have seen both helping themselves to whatever dry cat food scraps the feral cat(s) leave. I run them off with a broom when I can, and they fight back! It's a little scary to have one of them grab the broom and yank on it, or charge me.
I saw one of the opossums attacked one of the feral cats once, and that's what turned the tide for me: these marsupials had to
go. I didn't mind them much until then.
I've also seen foxes around, and have the usual contingent of birds for a suburban neighborhood, including vultures and hawks. Occasionally as I drive through the neighborhood, I'll see a venue (I had to look that up
) of vultures camped out on a neighbor's lawn; I haven't had the (dubious) pleasure of being visited so. No Bald Eagles here.
I did see a Bald Eagle once in my town, though, on February 1, 2003; my son and I were driving to NASA. My usual path there takes me through USDA property (rolling hills and fields), and as soon as I drove onto the property, I saw a Bald Eagle wheel in the sky and head north. I have driven through that USDA site countless times over the years (decades), and had not ever seen an eagle there, nor have I seen one since.
My usual bike trail takes me to and around a lake; this year, I've been seeing cormorants in the lake. Also beavers; I now see them regularly when I ride in the evening. Rabbits and deer, too, and turtles, though not as many turtles this year as in years past.
A lot of cranes also come during the summer months along with ducks and geese. 
