This recording contains sounds equally from nature and humans. There are four instances when a car will drive right next to microphone and zoom past from the right channel to the left. Essentially this entire 2 hour recording has ambience of vehicles driving along the freeways in the distance as well as consistent sounds of bird calls. There are a few instances where a squawking bird begins calling quite close to the microphone and the timbre of its voice is very clear. The rest of the bird calls are are a little off in the distance and only vary between birds once about three times.