From a practical point of view you would need to put in the time and effort to learn about your drone, and get pretty decent at flying it without crashing. If you want to do this, over and above getting the surveillance you want, then yes, I think you could do several interesting things in this regard.
If you want to just keep track of what your wildlife is doing, get a few remote
wildlife cameras and place them in strategic areas. That should give you a good idea, and it will cover night time activity too, which a drone won't.
If you go the drone route, you could keep it simple and just fly around your property every once in a while and have a look around.
Or, one step up from that, capture images at various locations on your property, and compare them with earlier images. I would use images rather than videos because you probably want to be able to toggle between them on your screen to look for differences. Capture the images with a Mavic or
Phantom 4, running Litchi or another third party mapping program such as dronedeploy.com . Dronedeploy will make the images into one large image.
For comparing, you could use something like Photoshop (10 bucks a month) or GIMP (free), and look for either the animals themselves or dug up areas, tracks, etc. At a height of 100 feet you will be able to see details that are roughly 6 inches in size, perhaps a little better than that.
Just some ideas - sounds like an interesting way to use a drone.
