ASP-??? Splithead Deer:

This creature has been seen at night. This ASP is a deer in appearance. It has been noted as bashing its head against a tree or rock to the point of a crushed skull cap and leaking brain matter. It sometimes will lick the resulting brain matter. This creature can and will stand on two legs, even with significant self-inflicted cranial injuries. It can speak, being noted as saying "I know you're there". It will harm itself to the point of drowning and presumed death.