Actually, a raven would be the sacrifice most likely to anger Asclepius! You'd better review the Ovid and Pindar selections! Asclepius was the son of Apollo by a mortal woman named Koronis (or Coronis, in the Latinized form), whose death was caused by Apollo's pet raven. While pregnant, Koronis was unfaithful to her immortal lover, and the raven tattled to his master. Apollo (or according to some versions of the story, his twin sister Artemis) zapped Koronis with invisible arrows. As his beloved was laid on her funeral pyre, the god regretted his jealous anger and snatched the baby Asclepius out of her womb. But it was too late to do anything for Koronis herself. The child grew up motherless. So no, a raven would definitely not be recommended as a sacrifice to Asclepius.