Techniques; Reproduction; Reproductive behaviour; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts Drosophila melanogaster; Drosophila subobscura (Drosophilidae ); Mathematical techniques; Pathological techniques; Hymenopteran parasites; Asobara tabida & Leptopilina heterotoma; Solitary parasite egg distributions among hosts, decision making models Asobara tabida (Braconidae ); Leptopilina heterotoma (Cynipidae ); Mathematical techniques; Pathological techniques; Egg laying; Dipteran hosts; Drosophila; Solitary parasite egg distributions among hosts, decision making models none