While this parasitic bacteria is disgusting, many wives, exes and girlfriends may like the idea of this entry! Why? Because Wolbachia wipes out all of the males in a species!
However, the bacteria is not really cognizant  that it is doing this. The bacteria  relies on the females and her eggs to propagate their species; therefore, the males are unnecessary to its survival. Wolbachia then either kills the males outright, or transforms any male embryos into females. The bacteria has even found a way to sneak their genomes into the cells of fruit flies, which is quite an impressive genetic feat!