Huevos de what?

OK, for the two of you who may have read the nature post and wondered what the sam hill the toucan was so interested in while perched in the tree, this is what I was talking about. It is called huevos de caballo. It's not for human consumption, but the birds love it, especially when they split apart and they can get at the insides. There has to be a real name for this fruit, but no one will tell us what it is. They just tell us the name and then giggle. For those still in the dark, huevos means eggs, while caballo means horse. Take a close look at the picture. Still stumped? We're sure you can figure it out.