There were no other deer around, which is unusual. Most of the time they travel in small family groups. This was probably a young stag (the light was poor and I didn't get a good look at him as he flashed by) looking for a doe. It's a good thing I wasn't out there to interrupt his flight. Young stags can be aggressive.
All the frogs signing tonight are certainly not dangerous, though. I intend to spend some time listening to them. Sitting in one spot listening to them. Moving would be difficult, as I made way too much fettuccine Alfredo tonight, and it was way too good to become leftovers.