We all know and love the world's most famous Boo, but the adorable pomeranian and Facebook phenomenon isn't the only cute Boo out there. Meet Boo the orangutan, who made his debut at the Madrid Zoo this week. The 9-month-old cutie lost his mother a few months ago, and has since been adopted by another female orangutan and is being bottle-fed by zookeepers. For more cuteness, click away.
Image Source: Getty