@johncarlosbaez Thanks for the reference. Parasitic wasps are crazy biology.
In the case cited below, when the parasitic wasp injects its eggs into a host (for example, a caterpillar), it also injects polydnavirus (PDV) particles. These PDV virions are, remarkably, coded for by the wasp's genome.
The virus then causes the host to express viral gene products that alter the immune defenses, growth and development of the host to optimize conditions for development of the wasp’s offspring.