What does my creepy black bat dream mean?

I had this dream the other night where i walked out my back door at night and i saw this thing. It was huge. About 15 feet long and 10 feet tall and it was black and hovering above the ground. It was a bat like thing with huge wings and glowing red eyes. It was also making this strange howling noise. Its very hard to explain what it was. Does anyone know what this dream could mean?