Final answer:
The exact animal sacrificed by Vucub-Kame in 'Gods of Jade and Shadow' for his prophecy is not stated in the provided reference materials. Mesoamerican religious context features a deep connection with animals, but the specific detail requires direct reference to the text.
Step-by-step explanation:
In Gods of Jade and Shadow by Moreno-Garcia, animals play a crucial role in the mythic storytelling, especially within the Underworld of Xibalba. However, none of the provided materials explicitly mention the animal that Vucub-Kame sacrifices for his prophecy within this particular literary work. According to the sources, Mesoamerican cultures had a rich religious context with a plethora of gods associated with various elements of life and nature. It's essential to note the significance of animals like the jaguar, serpent, and dog in symbology and ritual practices. We do not have a direct citation from the novel regarding the sacrificial animal used by Vucub-Kame; hence, we cannot provide an accurate answer to this specific literary question without referencing the text of Gods of Jade and Shadow directly.