Strix

The strix is described as a large-headed bird with captivating eyes, predatory beak, greyish white wings, and hooked claws. This is the only thorough description of the Strix in Classical literature. In other sources it is described as being dark-coloured. The Strix was a nocturnally crying creature that positioned it's feet upwards and head below, according to a greek myth form pre-300 BC. It is probably meant to be an owl, but is highly suggestive of a bat which hangs upside-down.