The Gold Llama is the twenty-sixth treasure that can be found in Uncharted: Drake's Fortune.
The Gold Llama is found in Chapter 6 - Unlocking the Past. This next one can be found after defeating the small group of pirates on the walkway overlooking the courtyard. While making your way to your next destination, you'll have to do some platforming. The llama is behind the small green trees and a pile of rubble.