First jungle biome mob teased by Jeb, yellow mob is yellow

I'm not entirely sure what it is, but Jens (the lead developer for Minecraft), teased the first mob designed for the jungle biome in this picture. At first glance, you assume it's a practical joke because you see a chicken. But if you look all the way to the right, you see a yellow face in the bushes. Jens didn't give any details about the mob besides that it's the first mob made from scratch by Mojang's new AI specialist, @jonkagstrom on Twitter. My best guess is that the mob is a yellow monkey, but it's impossible to tell for sure. Leave your guesses in the comments section below!

Source: Twitter