Although estimates vary, it is generally conceded that at least ten percent of the human population of our planet underwent metamorphosis on that single day, with a further twenty percent beginning more prolonged somatic transformations. We have come to refer to the Changed variants as metatypes. Most of the Changed became what are commonly called "orks" (H . sapiens robustus) , and the second most common metatype (H . sapiens ingentis) is often called a "troll." But there have been a bewildering variety of Changed, ranging from those who remain almost indistinguishable from basic human stock to those about whom it is hard to see anything human. Despite striking physical differences, research has shown that the common metatypes, while breeding true within a metatype, remain capable of breding with H . sapiens sapiens , thereby maintaining all the variety within the scientific definition of a species.