The Monkey Vanity Pet is a pet in The Elder Scrolls Online
How to get
Play in the Beta Event taking place Mar 14, 2014 through Mar 17, 2014 (or in prior Betas that promised this reward)
This will unlock an exclusive monkey vanity pet for PC/Mac that you can have at launch.
It should arrive by mail to your first character
How to redeem
Added: For Beta, Its supposed to arrive by mail but only to one of your characters. Check all your alts and hopefully you didn't delete the one that got the mail. If you find it, place the monkey in your bank for your main character.
You can get a Beta Key for the event here: