Continuning the Amazon animal theme, I’d like to introduce you to the Agouti. Smaller than a capybara, this rodent is the only one who can open the hard shell of a brazil nut. And squirrel-like, agoutis bury the nuts and forget about some, so new trees sprout from the buried nuts.
In this video of agouti (at what I consider a poor zoo habitat) you can hear the agoutis gnawing on the nuts.
Agoutis come in black, too.