Dosseroos were believed to be modest creatures and would only try and mate if a male and female dosseroo accidentally climbed into a pouch at the same time. Any young dosseroos would inevitably be brought up in a large number of different pouches, which is why it’s believed these marsupials lost their sense of belonging and identity over the generations.
This added to the natural ennui of these marsupials and affected their collective will to live. When the bush fires came, the dosseroos had no inclination to escape and were consumed en masse by the flames.
Excerpt from – Animals Evolution Avoided