Among the following animal species, which one has the longest memory?

Crows have a long memory as well. Long story short, I did a bad thing to a crow once, and his family never forgave me. They got organized and tried to kill me. This went on for months. Every time I left my apartment building, they launched a viscous attack and took out innocent bystanders as well. Lessons learned.

"So long and thanks for all the fish!" ;)