According to popular science, for the first time, scientists have observed one virus that attaches itself to another virus. Basically, these viruses are preying on the other viruses to replicate themselves. They do this by attaching themselves to the neck of the other virus. It's one virus that starts sucking on another. Just to get technical for a moment, the viruses do that as a group. They are infecting each other with a type of bacteria. The vampire virus was discovered by scientists at the University of Maryland