Creepy

These marks were on our back fence this morning. There was nothing whatsoever to indicate how they were made (they were on the inside of the yard and that gate is locked with a padlock; we're also sure no one came into the yard by another gate). We're sure it was blood, and it washed off easily, but it rattled us both a little. It looked violent and almost occultish. It really, really creeped me out. There were no feathers, no half dead animals lying anywhere, no clues whatsoever.