By Brian Connors (connorbd@bc.edu)
You see, the Pongo are chimpanzees. Seems these two vampires had a knack for experimenting with the Embrace, and would often play with the idea that animals could be Embraced as well as humans. It worked occasionally; rats usually survived the Embrace, only to have the sire find the next evening a suspicious pile of ashes not far from said rat's burrow. Pigs generally survived. The result always seemed to be a good deal more intelligent than the original creature. But until these two went to work on a chimp population, no primate had ever survived.
The Pongo are thought to survive because of chimps' genetic proximity to humans. They do gain some measure of intelligence (one "prince" is said to have the intelligence of a human 10 year old), but they do have the advantage of being able to survive in the sunlight where most vampires can't.