Ravens

evilsupplyco:

Ravens are freelance messengers. If you have something to say and trouble saying it, find one and tell it your secret, tell it who to find, and pay the requested price. Because of their wondrous nature, the recipient does not need to be alive.

But do not send lies or mistruths. They will know, either immediately or in short order.

Their obsidian eyes see much and their network is deeper than is easily comprehensible, even to the very learned.