From what i know there are 5 native roaches there: Ectobius lapponicus, Ectobius sylvestris, Ectobius erythronotus nigricans, Phyllodromica maculata, Phyllodromica megerlei. But I don´t keep single one of them... maybe I should :-) Its starting to be warmer here so maybe i could go to the forest and see if i find some... There are also 6 invasive species: Blatta orientalis, Periplaneta americana, Periplaneta australasiae, Periplaneta brunnea, Blatella germanica and Supella longipalpa but most of these dont survive our winter imo... luckily i guess