I've researched the Foscam camera you mentioned and I see on their website they have a guide on setting up port forwarding for it which at first doesn't sound promising, but they do mention that by default the camera comes set up to use port 80 which is perfect if it actually works. I'll have to contact Foscam directly to confirm it.
In the reviews I've read they the one negative that keeps popping up is the size of the wire bundle sticking out the back of the camera mount, and people talking about they weren't able to flush mount it without having to drill some substantial holes in the wall and/or using a electrical box for mounting. That's going to be a bit of an issue up in a tree, but I'll contact them anyway to see if they have any other models that offer something more in line with what I need.
If any other cameras come to mind please let me know.
Thanks again for the information...much appreciated.