"The myth of the Jackalope, it's germanic cousin the Wolpetinger and the swedish Skvader is that they are creatures so shy that they have the magical ability to be invisible to the sober eyes. And they live deep in the mountains. Thus they can only be seen by drunk mountaineers.
Some believe they exist. Many believe the alcohol is simply to blame for the sightings.

But that is not true.
It is theorized that the jackalope's myth comes from sightings of rabbits infected by the Shope papilloma virus. It causes cancerous growths on the head that could be mistaken for horns or teeth."