Hi, I know this post is old, but i came across it looking for another bird sound and had to reply because I'm pretty sure I know exactly what the noise is. I'm surprised nobody else has posted this. Southern Flying Squirrels. http://www.wildlifeofct.com/southern%20flying%20squirrel.html I live in Orlando and they're everywhere, yet nobody knows they're around because they come out at exactly dusk, party all night, and are in bed before you wake up. But if you happen to have a window right outside a tree they live in, they'll keep you up for hours. I had this problem in my old house. I have them living in my yard now as well, but fortunately their tree is on the other side of the house. Grab a flash light and hang out and look for them. But have patience because they're hard to spot at first. Here's a link to the sound. Here is a link that might be useful: southern flying squirrel

hmmmm Dirtgirl, I had no idea they were up at night. I would have bet it to be a mocker. Can you find it with your night vision binocs? (just kidding.....since you probably don't have any). I never thought I would tire of any birds songs either, but last summer, I had a red-eyed vireo around, who sang non-stop, all day. Alright already!! lol!

This really gets us down into the nitty-gritty of finely detailed plumage differences. I ruled out female Rose-breasted Grosbeak: the bill is too small, brown cheek patch not large and prominent enough, iris not big enough, brown on throat (rather than the white throat of the female RBGR), white upperwing bars are actual bars (whereas as the female RBGR shows white spotted bars). Female RBGR also show a more defined white supercilium. RBGR don't show pink legs. The bird in the photo looks the part of a female Purple Finch.

Try a White-crowned sparrow. Knowing where you are would help narrow it down. Susan