The substance was disclosed on Friday April 13th. It was Didelphis virginiana (The Virginia Opossum)
The Virginia opossum (Didelphis virginiana), commonly known as the North American opossum or tlacuache in Mexico, is the only marsupial found in North America north of Mexico. A solitary and nocturnal animal about the size of a domestic cat, and thus the largest opossum, it is a successful opportunist. It is familiar to many North Americans as it is often seen near towns, rummaging through garbage cans, or lying by the road, a victim of traffic.
VIDEO: Deciding to be a prover or a supervisor (Watch Video)
Watch this video if you are thinking about participating in a proving. It describes the proving process and the basic responsibilites of a prover or a supervisor.