iOS Camera View Finder with Descriptions on

This morning, I tried to take a picture of a mockingbird performing at the top of a power pole in my backyard. I didn't have a tripod, and held the phone up near my face to aim. The zoom just wasn't powerful enough to get him, but VO certainly identified the power pole and lines, then the trees and walls and houses. Had a little difficulty holding the camera steady, and it gave me a fairly real-time description as I jostled the phone.
So I left the focus on the view finder and walked around the side of my house, where a few ancient trees in the abandon, neighboring yard harbor lots of birds. Predictably, they all went silent, then flew away when I approached. It did locate one bird in one brief description. I did like being able to get descriptions of the tree tops to find out that they aren't completely dead up there. It also described dirt and rocks and sticks on the ground as I walked.
The down side is it used up a lot of battery. The real-time feel of getting glimpses of the surroundings was fun, and might even be useful. Guess I could always use a battery pack.