A simple explanation is that these wasps and microwasps were originally the same species, but due to variation (e.g. size or digestion), the larger ones evolve

A simple explanation is that these wasps and microwasps were originally the same species, but due to variation (e.g. size or digestion), the larger ones evolved to bite their host, while the smaller ones for some reasons could not feed on the host, so they left with the only option to cannibalize on their former relatives. Now we speed up the simulation, and after millions of time steps they will become agents of a different species. BTW: are there any foundational ABM[1] models that explain how free-living species become symbiotic, parasitic, or ectoparasitic? --- [1] Agent-based Modeling