While predator calling this date, I was targeting bobcats with an electronic call. (I mention this because with this particular call, only a bobcat would be expected to respond. A fox, coyote, coon, etc. would not respond to this call.) After about 10 minutes of calling, I heard a sound from behind me that I could not identify. I was using a varmint light, which has a red filter. This light is not normally readily seen by predators. I shined the light toward the sound, and saw what I thought was a bear. It was dark in color, but everything was either light or dark because of the red filter.
I have hunted in the West several times, and seen many bears. I initially thought that's what this was. But as stated earlier, a predator does not respond (normally) to this light. But this animal did. It stood up and moved away very rapidly on it's two "hind" legs. While on all fours, it appeared to be a bear. Upright, it appeared to be around 5-foot tall with a fairly large stride. I wasn't able to notice any other details because of the light source and because of how quickly it moved off.
Bears do not move great distances on their hind legs, and especially not rapidly. It made this sound continuously as it moved away, gradually decreasing in volume until I couldn't hear it any longer. I'm not sure what this was, but I'm quite certain what it was not, and it was not a bear, a hog, or any other animal native to this area.
via (Link: bfro.net)