I've one of those annoying little things that's been bugging me. Last week while I was out walking one of my dogs, I heard some kind of weird animal sound off in the distance that I couldn't identify. It sounds crazy, but the closest thing I could think of was a Zebra, but I can't imagine there being one around here. Our area is fairly urban, but the neighborhood across a street from does have a bunch of horse properties in it, and driving by I've seen at least one house with a whole bunch of horses in the back, so there are definitely equines around. When I mentioned it to my mom she thought it could have been a mule or donkey. Either way, I'm pretty sure it was equine, but it wasn't a regular horse sound.
I've been trying to listen on my dog walks each morning since then, and so far I've only heard it one more time, but it was to far off in the distance to hear it clearly that time.